The document discusses percentage increases and decreases and using multipliers to calculate them. It introduces calculating percentages as fractions of the original value and using multipliers to directly calculate the new value from the original. Examples are provided for calculating percentage increases and decreases by multiplying the original value by the appropriate multiplier for the given percentage change. Students are assigned questions from the textbook and workbook on calculating percentage changes using multipliers.
This document provides information and examples for working with percentages, including:
- Converting between fractions, decimals, and percentages.
- Finding percentages of numbers with and without a calculator.
- Calculating profit and loss percentages from sale prices.
- Solving reverse percentage problems to find original values.
- Expressing one quantity as a percentage of another.
The document demonstrates each concept through clear step-by-step worked examples.
This document discusses how to express one quantity as a percentage of another. It provides examples of calculating percentages, including percentage increases and decreases. It explains that a percentage of a number can be found by converting the percentage to a fraction or decimal and multiplying. The document also introduces methods to shorten the process of adding or subtracting percentages using multipliers.
this document is useful for all students preparing for placement. this document contains aptitude techniques. for each technique examples are shown. since i could not upload the ppt due to some technical problem the arrangment of text will not be in order.
examples are not stereo typed. all the techniques are taken from various internet sources hence could not be acknowledge individually. those who have any objections please mention in the comment box so that those particular portion could be removed.
The document contains examples and practice problems for calculating percentages. It includes examples of calculating a 12% increase, 52% decrease, 10% and 30% discounts on original prices, a 4.5% sales tax on an item, and an 85% markup on a wholesale price. Students are guided through setting up and solving percentage calculation problems step-by-step.
The document contains examples and practice problems for calculating percentages. It includes examples of calculating a 12% increase, 52% decrease, 10% and 30% discounts on original prices, a 4.5% sales tax on an item, and an 85% markup on a wholesale price. Students are guided through setting up and solving percentage calculation problems step-by-step.
How To Do KS2 Maths SATs Paper A Percentage Questions (Part 1)Chris James
This document provides guidance on calculating percentages for KS2 maths SATs exams. It explains that percentages questions will ask the reader to calculate a percentage of an amount. It then walks through examples of calculating 5%, 10%, 15% and other percentages of various amounts, including money amounts. The document emphasizes calculating the 10% first before calculating smaller percentages that are portions of 10%, like 5%. It concludes by providing some practice problems for the reader to try calculating percentages on their own.
The document introduces percentages and provides examples and explanations of key percentage concepts such as:
- Percent means out of 100
- Methods for converting between percentages, fractions, and decimals
- Finding a percentage of a number by changing the percentage to a fraction and multiplying
- Understanding when to add or subtract percentages depending on if an amount is increasing or decreasing
- Using percentages in contexts involving money such as calculating discounts, tax, or price increases.
This document contains examples and explanations of profit and loss calculations. It discusses key concepts like cost price, selling price, profit percentage, loss percentage, and discount percentage. It provides formulas for calculating profit, loss, selling price, cost price, and discount in different scenarios. It then lists 22 practice problems with solutions for calculating profit/loss percentages and cost/selling prices given various price markups and discounts.
This document provides information and examples for working with percentages, including:
- Converting between fractions, decimals, and percentages.
- Finding percentages of numbers with and without a calculator.
- Calculating profit and loss percentages from sale prices.
- Solving reverse percentage problems to find original values.
- Expressing one quantity as a percentage of another.
The document demonstrates each concept through clear step-by-step worked examples.
This document discusses how to express one quantity as a percentage of another. It provides examples of calculating percentages, including percentage increases and decreases. It explains that a percentage of a number can be found by converting the percentage to a fraction or decimal and multiplying. The document also introduces methods to shorten the process of adding or subtracting percentages using multipliers.
this document is useful for all students preparing for placement. this document contains aptitude techniques. for each technique examples are shown. since i could not upload the ppt due to some technical problem the arrangment of text will not be in order.
examples are not stereo typed. all the techniques are taken from various internet sources hence could not be acknowledge individually. those who have any objections please mention in the comment box so that those particular portion could be removed.
The document contains examples and practice problems for calculating percentages. It includes examples of calculating a 12% increase, 52% decrease, 10% and 30% discounts on original prices, a 4.5% sales tax on an item, and an 85% markup on a wholesale price. Students are guided through setting up and solving percentage calculation problems step-by-step.
The document contains examples and practice problems for calculating percentages. It includes examples of calculating a 12% increase, 52% decrease, 10% and 30% discounts on original prices, a 4.5% sales tax on an item, and an 85% markup on a wholesale price. Students are guided through setting up and solving percentage calculation problems step-by-step.
How To Do KS2 Maths SATs Paper A Percentage Questions (Part 1)Chris James
This document provides guidance on calculating percentages for KS2 maths SATs exams. It explains that percentages questions will ask the reader to calculate a percentage of an amount. It then walks through examples of calculating 5%, 10%, 15% and other percentages of various amounts, including money amounts. The document emphasizes calculating the 10% first before calculating smaller percentages that are portions of 10%, like 5%. It concludes by providing some practice problems for the reader to try calculating percentages on their own.
The document introduces percentages and provides examples and explanations of key percentage concepts such as:
- Percent means out of 100
- Methods for converting between percentages, fractions, and decimals
- Finding a percentage of a number by changing the percentage to a fraction and multiplying
- Understanding when to add or subtract percentages depending on if an amount is increasing or decreasing
- Using percentages in contexts involving money such as calculating discounts, tax, or price increases.
This document contains examples and explanations of profit and loss calculations. It discusses key concepts like cost price, selling price, profit percentage, loss percentage, and discount percentage. It provides formulas for calculating profit, loss, selling price, cost price, and discount in different scenarios. It then lists 22 practice problems with solutions for calculating profit/loss percentages and cost/selling prices given various price markups and discounts.
Presentation6 -principles of economics Kareem Hossam
This document discusses various costs that a business must consider when starting a factory, including:
- Explicit costs that require money outlays, such as wages, and implicit costs that do not require payment, such as the owner's time.
- Fixed costs that do not vary with output, variable costs that do vary with output, and how total costs are calculated.
- Marginal costs, which represent the increase in total costs from producing one more unit, and how marginal costs are used to determine the optimal level of production.
To find the selling price of softball bats:
- The store buys each bat for $35
- The mark-up on each bat is 40% of the purchase price
- To calculate the mark-up, express 40% as a decimal (0.4) and multiply it by the purchase price of $35
- The mark-up is 0.4 × $35 = $14
- To get the selling price, add the purchase price ($35) to the mark-up ($14)
- Therefore, the selling price of each softball bat is $35 + $14 = $49
1. The gold mine is expected to be exhausted within 20 years. With annual costs of $750,000 and $120/ton, it earns $450/ton and has annual output of 25,000 tons. The property valuation is $53,745,535.
2. The timber land was bought for $8,000,000 and sold for $200,000 after 14 years of $1,400,000 average annual profits. The investment rate is 13.2%.
3. For a company with 4 machines, the total annual straight-line depreciation charge is $49,600 by group depreciation and $47,666.67 by composite depreciation.
This document provides formulas and examples for calculating profits, losses, discounts, and marked prices. It defines key terms like cost price, selling price, marked price, discount, and percent discount. It provides examples of calculating discounts and profits/losses for various scenarios involving single or successive discounts. The examples demonstrate calculating discounts on goods that are initially priced or marked up from the cost price by the retailer or wholesaler. The document also distinguishes between trade discounts provided by manufacturers/wholesalers and cash discounts provided by retailers to encourage prompt payment.
The document discusses compound interest and repeated percentage change. It provides examples of how to calculate compound interest over multiple years. Compound interest provides a better return than simple interest because interest is applied to both the original amount and accumulated interest each year. The document also discusses how to calculate repeated percentage increases or decreases by multiplying percentage multipliers together. This can be used to find overall percentage changes from multiple increases and decreases.
In this slides deck, you will understand
Competitive Market and Monopoly.
With worksheet, you could write by your hand and understand the concept of basic market theory.
The document provides a word problem involving profit and loss calculations for the cost price of a table. It states that a person sold a table at a 15% gain. However, if they had bought it for 25% less and sold it for Rs. 60 less, they would have made a 32% profit. Using this information, the cost price of the table is calculated to be Rs. 375. Shortcut calculations are also provided to solve the problem more quickly.
04 theory of production and costs - 4.pptDipto Biswas
This document discusses the theory of production and costs. It covers short and long run production functions, the behavior of costs including fixed and variable costs, and the laws of diminishing returns and returns to scale. It also defines explicit and implicit costs, and how they relate to accounting profit and economic profit. Graphs are included to illustrate concepts like the production function, total cost curve, and how average fixed cost, average variable cost, and average total cost vary with output. The key differences between short run and long run costs are also explained.
This document provides information and examples for working with percentages and discounts. It covers converting between fractions, decimals, and percentages; finding percentages of quantities; calculating profit and loss; reversing percentages to find original values; and writing quantities as percentages of others. Examples are provided for each topic without and with a calculator. The next session will cover working with ratios.
This document provides an overview of profit and loss calculations in consumer arithmetic. It includes definitions of key terms like cost price, selling price, profit, and loss. It also presents formulas for calculating profit and loss amounts and percentages. Several examples are worked through, such as calculating profit percentage when items are sold above cost price, or calculating original cost price when items are sold at a loss. The document also discusses calculating selling prices after discounts from a marked price.
Cost Vs Budget PowerPoint Presentation SlidesSlideTeam
This deck consists of total of twenty slides. It has PPT slides highlighting important topics of Cost Vs Budget PowerPoint Presentation Slides. This deck comprises of amazing visuals with thoroughly researched content. Each template is well crafted and designed by our PowerPoint experts. Our designers have included all the necessary PowerPoint layouts in this deck. From icons to graphs, this PPT deck has it all. The best part is that these templates are easily customizable. Just click the DOWNLOAD button shown below. Edit the colour, text, font size, add or delete the content as per the requirement. Download this deck now and engage your audience with this ready made presentation. http://bit.ly/2vMBtbd
This document provides solutions to math problems from Bangladesh Bank written exams from 2001-2017. It begins with an introduction by the editor Yousuf Ali, who compiled solutions from an existing textbook. The document then lists 13 math problems from prior exams, showing the questions and providing step-by-step solutions. It focuses on percentages, profit/loss, interest, ratios, and other quantitative reasoning questions commonly found in competitive exams. The document serves as a study aid for the types of math problems examined by the Bangladesh Bank over many years.
This tutorial provides an overview of breakeven analysis, including: defining breakeven analysis as a tool to determine the sales volume needed to cover total costs; explaining the concepts of fixed costs, variable costs, revenue, and profit; demonstrating how to calculate the breakeven point using an example of a burger business; and concluding that breakeven analysis is a simple tool to determine if a product is priced correctly and how fixed costs, price, and sales volume impact profits.
The document provides an overview of topics related to profit, loss, and discounts that will be covered. These include definitions and examples of profit, loss, cost price, selling price, and profit/loss percentages. It also gives frequently asked examples involving multiple transactions with markups, discounts, and losses calculated. Several examples are provided and worked through step-by-step to demonstrate calculating profit/loss percentages from cost price and selling price data, even when quantities are changing between transactions.
Thank you for the feedback, I appreciate you taking the time to ensure I understand these concepts fully. Converting fractions to decimals is an important mathematical skill.
The above is the part of Quantitative Aptitude, it is just a topic name "Percentages". From this you can easily learn few basics of how numericals of mathematics that to be dealt with few shortcuts. I hope this will be useful for everyone to understand few things about Quantitative Aptitude. Specially this is for the persons who are preparing for the competative exams.
Operation and Production Mgt Assignment.pdfSeetal Daas
The document contains 6 problems related to calculating productivity and break-even analysis in operations management.
Problem 1 calculates the productivity of 3 employees producing policies and a team producing units. Problem 2 calculates the productivity of 2 shifts producing proposals and policies.
Problem 3 calculates the productivity and labor productivity ratio of a 3-credit course. Problem 4 calculates the productivity per week for a process based on units produced, labor, material and overhead costs.
Problems 5 and 6 continue calculating productivity and labor productivity ratios in various scenarios. The document then shifts to calculating break-even points and total contribution to profit in 4 problems with various cost and sales data.
Finally, a preference matrix problem calculates scores for a new product
This document contains notes and practice problems for a math lesson on percents. It includes examples of finding percent increases and decreases, percent discounts and markups, and solving proportions involving percents. Warm-up questions ask students to find 70% of 1/2 and change fractions and percents to decimals. The document then provides examples and practice problems for students to work through related to percents.
1. The document provides examples of time value of money problems involving present value, future value, interest rates, and number of periods calculations. It gives the calculations for various cash flows received or paid in different periods with different interest rates.
2. It includes problems calculating NPV for projects such as factories, machines, and ships where the cash flows include costs, revenues, operating costs, refit costs, and salvage value over multiple periods.
3. The last examples calculate the amount of annual savings needed to buy a boat in 5 years and the annual annuity payment an individual can expect based on investing a present value over their life expectancy.
- The document discusses the concepts of accounting costs, economic costs, fixed costs, variable costs, and marginal costs from a firm's perspective.
- It provides an example of a factory owner, Alexander, who produces fishing lures, to illustrate how to calculate accounting profit versus economic profit based on the costs of production.
- Key costs discussed include explicit costs like wages versus implicit opportunity costs, how costs shape the short-run average and marginal cost curves, and the principle of diminishing returns.
Andreas Schleicher presents PISA 2022 Volume III - Creative Thinking - 18 Jun...EduSkills OECD
Andreas Schleicher, Director of Education and Skills at the OECD presents at the launch of PISA 2022 Volume III - Creative Minds, Creative Schools on 18 June 2024.
Presentation6 -principles of economics Kareem Hossam
This document discusses various costs that a business must consider when starting a factory, including:
- Explicit costs that require money outlays, such as wages, and implicit costs that do not require payment, such as the owner's time.
- Fixed costs that do not vary with output, variable costs that do vary with output, and how total costs are calculated.
- Marginal costs, which represent the increase in total costs from producing one more unit, and how marginal costs are used to determine the optimal level of production.
To find the selling price of softball bats:
- The store buys each bat for $35
- The mark-up on each bat is 40% of the purchase price
- To calculate the mark-up, express 40% as a decimal (0.4) and multiply it by the purchase price of $35
- The mark-up is 0.4 × $35 = $14
- To get the selling price, add the purchase price ($35) to the mark-up ($14)
- Therefore, the selling price of each softball bat is $35 + $14 = $49
1. The gold mine is expected to be exhausted within 20 years. With annual costs of $750,000 and $120/ton, it earns $450/ton and has annual output of 25,000 tons. The property valuation is $53,745,535.
2. The timber land was bought for $8,000,000 and sold for $200,000 after 14 years of $1,400,000 average annual profits. The investment rate is 13.2%.
3. For a company with 4 machines, the total annual straight-line depreciation charge is $49,600 by group depreciation and $47,666.67 by composite depreciation.
This document provides formulas and examples for calculating profits, losses, discounts, and marked prices. It defines key terms like cost price, selling price, marked price, discount, and percent discount. It provides examples of calculating discounts and profits/losses for various scenarios involving single or successive discounts. The examples demonstrate calculating discounts on goods that are initially priced or marked up from the cost price by the retailer or wholesaler. The document also distinguishes between trade discounts provided by manufacturers/wholesalers and cash discounts provided by retailers to encourage prompt payment.
The document discusses compound interest and repeated percentage change. It provides examples of how to calculate compound interest over multiple years. Compound interest provides a better return than simple interest because interest is applied to both the original amount and accumulated interest each year. The document also discusses how to calculate repeated percentage increases or decreases by multiplying percentage multipliers together. This can be used to find overall percentage changes from multiple increases and decreases.
In this slides deck, you will understand
Competitive Market and Monopoly.
With worksheet, you could write by your hand and understand the concept of basic market theory.
The document provides a word problem involving profit and loss calculations for the cost price of a table. It states that a person sold a table at a 15% gain. However, if they had bought it for 25% less and sold it for Rs. 60 less, they would have made a 32% profit. Using this information, the cost price of the table is calculated to be Rs. 375. Shortcut calculations are also provided to solve the problem more quickly.
04 theory of production and costs - 4.pptDipto Biswas
This document discusses the theory of production and costs. It covers short and long run production functions, the behavior of costs including fixed and variable costs, and the laws of diminishing returns and returns to scale. It also defines explicit and implicit costs, and how they relate to accounting profit and economic profit. Graphs are included to illustrate concepts like the production function, total cost curve, and how average fixed cost, average variable cost, and average total cost vary with output. The key differences between short run and long run costs are also explained.
This document provides information and examples for working with percentages and discounts. It covers converting between fractions, decimals, and percentages; finding percentages of quantities; calculating profit and loss; reversing percentages to find original values; and writing quantities as percentages of others. Examples are provided for each topic without and with a calculator. The next session will cover working with ratios.
This document provides an overview of profit and loss calculations in consumer arithmetic. It includes definitions of key terms like cost price, selling price, profit, and loss. It also presents formulas for calculating profit and loss amounts and percentages. Several examples are worked through, such as calculating profit percentage when items are sold above cost price, or calculating original cost price when items are sold at a loss. The document also discusses calculating selling prices after discounts from a marked price.
Cost Vs Budget PowerPoint Presentation SlidesSlideTeam
This deck consists of total of twenty slides. It has PPT slides highlighting important topics of Cost Vs Budget PowerPoint Presentation Slides. This deck comprises of amazing visuals with thoroughly researched content. Each template is well crafted and designed by our PowerPoint experts. Our designers have included all the necessary PowerPoint layouts in this deck. From icons to graphs, this PPT deck has it all. The best part is that these templates are easily customizable. Just click the DOWNLOAD button shown below. Edit the colour, text, font size, add or delete the content as per the requirement. Download this deck now and engage your audience with this ready made presentation. http://bit.ly/2vMBtbd
This document provides solutions to math problems from Bangladesh Bank written exams from 2001-2017. It begins with an introduction by the editor Yousuf Ali, who compiled solutions from an existing textbook. The document then lists 13 math problems from prior exams, showing the questions and providing step-by-step solutions. It focuses on percentages, profit/loss, interest, ratios, and other quantitative reasoning questions commonly found in competitive exams. The document serves as a study aid for the types of math problems examined by the Bangladesh Bank over many years.
This tutorial provides an overview of breakeven analysis, including: defining breakeven analysis as a tool to determine the sales volume needed to cover total costs; explaining the concepts of fixed costs, variable costs, revenue, and profit; demonstrating how to calculate the breakeven point using an example of a burger business; and concluding that breakeven analysis is a simple tool to determine if a product is priced correctly and how fixed costs, price, and sales volume impact profits.
The document provides an overview of topics related to profit, loss, and discounts that will be covered. These include definitions and examples of profit, loss, cost price, selling price, and profit/loss percentages. It also gives frequently asked examples involving multiple transactions with markups, discounts, and losses calculated. Several examples are provided and worked through step-by-step to demonstrate calculating profit/loss percentages from cost price and selling price data, even when quantities are changing between transactions.
Thank you for the feedback, I appreciate you taking the time to ensure I understand these concepts fully. Converting fractions to decimals is an important mathematical skill.
The above is the part of Quantitative Aptitude, it is just a topic name "Percentages". From this you can easily learn few basics of how numericals of mathematics that to be dealt with few shortcuts. I hope this will be useful for everyone to understand few things about Quantitative Aptitude. Specially this is for the persons who are preparing for the competative exams.
Operation and Production Mgt Assignment.pdfSeetal Daas
The document contains 6 problems related to calculating productivity and break-even analysis in operations management.
Problem 1 calculates the productivity of 3 employees producing policies and a team producing units. Problem 2 calculates the productivity of 2 shifts producing proposals and policies.
Problem 3 calculates the productivity and labor productivity ratio of a 3-credit course. Problem 4 calculates the productivity per week for a process based on units produced, labor, material and overhead costs.
Problems 5 and 6 continue calculating productivity and labor productivity ratios in various scenarios. The document then shifts to calculating break-even points and total contribution to profit in 4 problems with various cost and sales data.
Finally, a preference matrix problem calculates scores for a new product
This document contains notes and practice problems for a math lesson on percents. It includes examples of finding percent increases and decreases, percent discounts and markups, and solving proportions involving percents. Warm-up questions ask students to find 70% of 1/2 and change fractions and percents to decimals. The document then provides examples and practice problems for students to work through related to percents.
1. The document provides examples of time value of money problems involving present value, future value, interest rates, and number of periods calculations. It gives the calculations for various cash flows received or paid in different periods with different interest rates.
2. It includes problems calculating NPV for projects such as factories, machines, and ships where the cash flows include costs, revenues, operating costs, refit costs, and salvage value over multiple periods.
3. The last examples calculate the amount of annual savings needed to buy a boat in 5 years and the annual annuity payment an individual can expect based on investing a present value over their life expectancy.
- The document discusses the concepts of accounting costs, economic costs, fixed costs, variable costs, and marginal costs from a firm's perspective.
- It provides an example of a factory owner, Alexander, who produces fishing lures, to illustrate how to calculate accounting profit versus economic profit based on the costs of production.
- Key costs discussed include explicit costs like wages versus implicit opportunity costs, how costs shape the short-run average and marginal cost curves, and the principle of diminishing returns.
Andreas Schleicher presents PISA 2022 Volume III - Creative Thinking - 18 Jun...EduSkills OECD
Andreas Schleicher, Director of Education and Skills at the OECD presents at the launch of PISA 2022 Volume III - Creative Minds, Creative Schools on 18 June 2024.
How Barcodes Can Be Leveraged Within Odoo 17Celine George
In this presentation, we will explore how barcodes can be leveraged within Odoo 17 to streamline our manufacturing processes. We will cover the configuration steps, how to utilize barcodes in different manufacturing scenarios, and the overall benefits of implementing this technology.
Beyond Degrees - Empowering the Workforce in the Context of Skills-First.pptxEduSkills OECD
Iván Bornacelly, Policy Analyst at the OECD Centre for Skills, OECD, presents at the webinar 'Tackling job market gaps with a skills-first approach' on 12 June 2024
Level 3 NCEA - NZ: A Nation In the Making 1872 - 1900 SML.pptHenry Hollis
The History of NZ 1870-1900.
Making of a Nation.
From the NZ Wars to Liberals,
Richard Seddon, George Grey,
Social Laboratory, New Zealand,
Confiscations, Kotahitanga, Kingitanga, Parliament, Suffrage, Repudiation, Economic Change, Agriculture, Gold Mining, Timber, Flax, Sheep, Dairying,
THE SACRIFICE HOW PRO-PALESTINE PROTESTS STUDENTS ARE SACRIFICING TO CHANGE T...indexPub
The recent surge in pro-Palestine student activism has prompted significant responses from universities, ranging from negotiations and divestment commitments to increased transparency about investments in companies supporting the war on Gaza. This activism has led to the cessation of student encampments but also highlighted the substantial sacrifices made by students, including academic disruptions and personal risks. The primary drivers of these protests are poor university administration, lack of transparency, and inadequate communication between officials and students. This study examines the profound emotional, psychological, and professional impacts on students engaged in pro-Palestine protests, focusing on Generation Z's (Gen-Z) activism dynamics. This paper explores the significant sacrifices made by these students and even the professors supporting the pro-Palestine movement, with a focus on recent global movements. Through an in-depth analysis of printed and electronic media, the study examines the impacts of these sacrifices on the academic and personal lives of those involved. The paper highlights examples from various universities, demonstrating student activism's long-term and short-term effects, including disciplinary actions, social backlash, and career implications. The researchers also explore the broader implications of student sacrifices. The findings reveal that these sacrifices are driven by a profound commitment to justice and human rights, and are influenced by the increasing availability of information, peer interactions, and personal convictions. The study also discusses the broader implications of this activism, comparing it to historical precedents and assessing its potential to influence policy and public opinion. The emotional and psychological toll on student activists is significant, but their sense of purpose and community support mitigates some of these challenges. However, the researchers call for acknowledging the broader Impact of these sacrifices on the future global movement of FreePalestine.
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3. Mr Mahfooz
04/11/2023
TB Page 225-229 Lesson 10.1 Percentage increases and decreases
•To find 10% divide the original number by ten.
•To find 20% find 10% and double it.
•To find 50% half it.
•To find 25% half it, and half it again.
•To find 5% find 10% and half it.
•To find 1% divide by 100.
Quick percentage calculations
4. Mr Mahfooz
04/11/2023
TB Page 225-229 Lesson 10.1 Percentage increases and decreases
Percentages of Amounts
• Calculate 50% of 60
50% =
1
2
1
2
of 60 = 60 ÷ 2
= 30
• Calculate 25% of 60
25% =
1
4
1
4
of 60 = 60 ÷ 4
= 15
• Calculate 10% of 60
10% =
1
10
1
10
of 60 = 60 ÷ 10
= 6
5. Mr Mahfooz
04/11/2023
TB Page 225-229 Lesson 10.1 Percentage increases and decreases
Percentages of Amounts
• Calculate 30% of 60
• First calculate 10%
10% = 60 ÷ 10
= 6
• If 10% = 6, then 30% = 6 x 3 = 18
6. Mr Mahfooz
04/11/2023
TB Page 225-229 Lesson 10.1 Percentage increases and decreases
Tool kit:
We can
easily find-
1%
10%
20%
25%
50%
Find 60% of
900g
50%
10%
450g
90g
60% 540g
60% of 900g=540g
7. Mr Mahfooz
04/11/2023
TB Page 225-229 Lesson 10.1 Percentage increases and decreases
Tool kit:
We can
easily find-
1%
10%
20%
25%
50%
Find 21% of
400
20%
1%
80
4
21% 84
21% of 400=84
8. Mr Mahfooz
04/11/2023
TB Page 225-229 Lesson 10.1 Percentage increases and decreases
Tool kit:
We can
easily find-
1%
10%
20%
25%
50%
Find 46% of
500
25%
46% of 500=230
20%
1%
125
100
5
230
46%
9. Mr Mahfooz
04/11/2023
TB Page 225-229 Lesson 10.1 Percentage increases and decreases
Tool kit:
We can
easily find-
1%
10%
20%
25%
50%
Find 72% of
500
50%
72% of 500=360
20%
1%
250
100
5
1%
72%
5
360
x2
10. Mr Mahfooz
04/11/2023
TB Page 225-229 Lesson 10.1 Percentage increases and decreases
A computer accessories shop increased the price of
one of its printers from £80 to £100. Find the
percentage increase in price.
Percentage change
Original Price New Price
𝑃𝑒𝑟𝑐𝑒𝑛𝑡𝑎𝑔𝑒 𝑐ℎ𝑎𝑛𝑔𝑒 =
𝑛𝑒𝑤 𝑣𝑎𝑙𝑢𝑒 − 𝑜𝑟𝑖𝑔𝑖𝑛𝑎𝑙 𝑣𝑎𝑙𝑢𝑒
𝑜𝑟𝑖𝑔𝑖𝑛𝑎𝑙 𝑣𝑎𝑙𝑢𝑒
× 100
𝑃𝑒𝑟𝑐𝑒𝑛𝑡𝑎𝑔𝑒 𝑐ℎ𝑎𝑛𝑔𝑒 =
100 − 80
80
× 100
𝑃𝑒𝑟𝑐𝑒𝑛𝑡𝑎𝑔𝑒 𝑐ℎ𝑎𝑛𝑔𝑒 =
20
80
× 100
𝑃𝑒𝑟𝑐𝑒𝑛𝑡𝑎𝑔𝑒 𝑐ℎ𝑎𝑛𝑔𝑒 = 0.25 × 100
𝑃𝑒𝑟𝑐𝑒𝑛𝑡𝑎𝑔𝑒 𝑐ℎ𝑎𝑛𝑔𝑒 = 25%
11. Mr Mahfooz
04/11/2023
TB Page 225-229 Lesson 10.1 Percentage increases and decreases
Percentage change
Find the percentage decrease in the cost of the car in the sale. (1 decimal place)
Original Price Sale Price
Sale
𝑃𝑒𝑟𝑐𝑒𝑛𝑡𝑎𝑔𝑒 𝑐ℎ𝑎𝑛𝑔𝑒 =
𝑛𝑒𝑤 𝑣𝑎𝑙𝑢𝑒 − 𝑜𝑟𝑖𝑔𝑖𝑛𝑎𝑙 𝑣𝑎𝑙𝑢𝑒
𝑜𝑟𝑖𝑔𝑖𝑛𝑎𝑙 𝑣𝑎𝑙𝑢𝑒
× 100
𝑃𝑒𝑟𝑐𝑒𝑛𝑡𝑎𝑔𝑒 𝑐ℎ𝑎𝑛𝑔𝑒 =
33000 − 39500
39500
× 100
𝑃𝑒𝑟𝑐𝑒𝑛𝑡𝑎𝑔𝑒 𝑐ℎ𝑎𝑛𝑔𝑒 =
−6500
39500
× 100
In this case the
change is an
decrease. 𝑷𝒆𝒓𝒄𝒆𝒏𝒕𝒂𝒈𝒆 𝒄𝒉𝒂𝒏𝒈𝒆 = 𝟏𝟔. 𝟓%
26. Mr Mahfooz
04/11/2023
TB Page 230-234 Lesson 10.2 Using a multiplier
Percentage increase
The original amount is 100%:
100% 20%
We now have 120%
Find the result in a single calculation.
Now we add 20%
The value of Yousaf’s house has gone up by 20% in the
last year. If the house was worth £150 000 1 year ago,
how much is it worth now?
27. Mr Mahfooz
04/11/2023
TB Page 230-234 Lesson 10.2 Using a multiplier
120% = 120
100
= 1.20
So multiply by 1.2
Original Change New Multiplying Factor
100% +/- 100% +/- Change New/100
100% +20% 100% + 20% = 120% 120% ÷ 100 = 1.2
100% -25% 100% - 25% = 75% 75% ÷ 100 = 0.75
New value = Original value × Multiplying Factor
28. Mr Mahfooz
04/11/2023
TB Page 230-234 Lesson 10.2 Using a multiplier
120% of £150 000 = £180 000
So Yousaf’s house is now worth
= £180 000
So……………..
£180 000 = 1.2
×
£150 000
Multiplying Factor = 1.2
Original = £150 000
New value = Original value × Multiplying Factor
29. Mr Mahfooz
04/11/2023
TB Page 230-234 Lesson 10.2 Using a multiplier
Here are some more examples using this method
Increase £50 by 60%.
Percentage increase
Increase £86 by 7%.
160% × £50 = 1.6 × £50
= £80
107% × £86 = 1.07 × £86
= £92.02
31. Mr Mahfooz
04/11/2023
TB Page 230-234 Lesson 10.2 Using a multiplier
Percentage decrease
100% 30%
We now have 70% of the original amount.
70%
The original amount is 100% like this:
Now we subtract 30%
A CD walkman originally costing £75 is reduced by
30% in a sale. What is the sale price?
32. Mr Mahfooz
04/11/2023
TB Page 230-234 Lesson 10.2 Using a multiplier
70% = 70
100
= 0.70
So multiply by 0.7
Original Change New Multiplying Factor
100% +/- 100% +/- Change New/100
100% +20% 100% + 20% = 120% 120% ÷ 100 = 1.2
100% -25% 100% - 25% = 75% 75% ÷ 100 = 0.75
New value = Original value × Multiplying Factor
33. Mr Mahfooz
04/11/2023
TB Page 230-234 Lesson 10.2 Using a multiplier
70% of £75 = £52.50
So the sale price = £52.50
So……………..
£52.50 = 0.7
×
£75
Multiplying Factor = 0.7
Original = £75
New value = Original value × Multiplying Factor
34. Mr Mahfooz
04/11/2023
TB Page 230-234 Lesson 10.2 Using a multiplier
Here are some more examples using this method:
Percentage decrease
Decrease £320 by 3%.
Decrease £65 by 20%.
80% × £65 = 0.8 × £65
= £52
97% × £320 = 0.97× £320
= £310.40