037 lesson 25
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The document discusses the order of operations in mathematics, noting that operations inside parentheses should be performed first, then multiplication and division from left to right, followed by addition and subtraction from left to right. Several examples demonstrate evaluating expressions using these rules to avoid ambiguity and ensure only one correct solution. Precise use of order of operations is important for correctly solving arithmetic expressions with multiple operations.
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![Lesson 25<br />PUNCTUATION AND PRECEDENCE OF OPERATION<br />Objectives<br />After this lesson, the students are expected to:<br />describe the use of punctuations in mathematics;<br />solve expressions using some rules in solving integers;<br />discuss the series of operation.<br />Problem: Evaluate the following arithmetic expression shown in the picture: Solution: Student 1 Student 23 + 4 x 23 + 4 x 2= 7 x 2= 3 + 8= 14= 11It seems that each student interpreted the problem differently, resulting in two different answers. Student 1 performed the operation of addition first, then multiplication; whereas student 2 performed multiplication first, then addition. When performing arithmetic operations there can be only one correct answer. We need a set of rules in order to avoid this kind of confusion. Mathematicians have devised a standard order of operations for calculations involving more than one arithmetic operation.Rule 1: First perform any calculations inside parentheses.Rule 2: Next perform all multiplications and divisions, working from left to right.Rule 3: Lastly, perform all additions and subtractions, working from left to right.<br />1282065373126015603355109061The above problem was solved correctly by Student 2 since she followed Rules 2 and 3. Let's look at some examples of solving arithmetic expressions using these rules.<br />Example 1: Evaluate each expression using the rules for order of operations. Solution: Order of OperationsExpressionEvaluationOperation6 + 7 x 8= 6 + 7 x 8Multiplication= 6 + 56Addition= 62 16 ÷ 8 - 2= 16 ÷ 8 - 2Division= 2 - 2Subtraction= 0 (25 - 11) x 3= (25 - 11) x 3Parentheses= 14 x 3Multiplication= 42 <br />In Example 1, each problem involved only 2 operations. Let's look at some examples that involve more than two operations.<br />Example 2: Evaluate 3 + 6 x (5 + 4) ÷ 3 - 7 using the order of operations.Solution: Step 1: 3 + 6 x (5 + 4) ÷ 3 - 7 = 3 + 6 x 9 ÷ 3 - 7ParenthesesStep 2: 3 + 6 x 9 ÷- 7 = 3 + 54 ÷ 3 - 7MultiplicationStep 3: 3 + 54 ÷ 3 - 7 = 3 + 18 - 7DivisionStep 4: 3 + 18 - 7 = 21 - 7AdditionStep 5: 21 - 7= 14Subtraction<br />Example 3: Evaluate 9 - 5 ÷ (8 - 3) x 2 + 6 using the order of operations.Solution: Step 1: 9 - 5 ÷ (8 - 3) x 2 + 6 = 9 - 5 ÷ 5 x 2 + 6ParenthesesStep 2: 9 - 5 ÷ 5 x 2 + 6 = 9 - 1 x 2 + 6DivisionStep 3: 9 - 1 x 2 + 6 = 9 - 2 + 6MultiplicationStep 4: 9 - 2 + 6 = 7 + 6SubtractionStep 5: 7 + 6 = 13Addition<br />In Examples 2 and 3, you will notice that multiplication and division were evaluated from left to right according to Rule 2. Similarly, addition and subtraction were evaluated from left to right, according to Rule 3.<br />When two or more operations occur inside a set of parentheses, these operations should be evaluated according to Rules 2 and 3. This is done in Example 4 below.<br />Example 4: Evaluate 150 ÷ (6 + 3 x 8) - 5 using the order of operations.Solution: Step 1: 150 ÷ (6 + 3 x 8) - 5 = 150 ÷ (6 + 24) - 5Multiplication inside ParenthesesStep 2: 150 ÷ (6 + 24) - 5 = 150 ÷ 30 - 5Addition inside ParenthesesStep 3: 150 ÷ 30 - 5 = 5 - 5DivisionStep 4: 5 - 5 = 0Subtraction<br />Example 5: Evaluate the arithmetic expression below: Solution: This problem includes a fraction bar (also called a vinculum), which means we must divide the numerator by the denominator. However, we must first perform all calculations above and below the fraction bar BEFORE dividing. Thus Evaluating this expression, we get: <br />Example 6: Write an arithmetic expression for this problem. Then evaluate the expression using the order of operations. Mr. Smith charged Jill $32 for parts and $15 per hour for labor to repair her bicycle. If he spent 3 hours repairing her bike, how much does Jill owe him? Solution: 32 + 3 x 15 = 32 + 3 x 15 = 32 + 45 = 77 Jill owes Mr. Smith $77. <br />,[object Object],-513470-99939<br />WORKSHEET NO. 25<br />NAME: ___________________________________DATE: _____________ <br />YEAR & SECTION: ________________________RATING: ___________<br />Try to solve the following then explain.<br />Solution<br />109918504635543+5786-57=______________<br />(6754-65+64)(7)=___________<br />78÷39+5-65=______________<br />-4221798200026234x3-56+8=______________<br />(136-56+65)÷5=____________<br />343-65=___________________<br />1234+(-87)x8=______________<br />84-8+54(6)= _______________<br />4638-870=_________________<br />543+(-8)+(-78)(8)= __________<br />](https://image.slidesharecdn.com/037-lesson25-100627023829-phpapp01/85/037-lesson-25-1-320.jpg)
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The ski resort sold a total of 111,359 day ski tickets in January. To calculate the average number of tickets sold per day, the total number of tickets was divided by 31, the number of days in January. The average number of tickets sold per day was 3,589.
The Whole
This document provides an overview of a modular workbook on mastering fundamental math operations and integers. It contains two units: [1] Mastering basic fundamental operations with whole numbers, covering addition, subtraction, multiplication and division, and [2] Working with integers. The goal is for students to understand the concepts and master skills in performing the four operations on whole numbers and integers through lessons, exercises and word problems. It was created by education students and their advisers to serve as a supplementary reference for teachers and students.
032 lesson 20
The document defines integers as natural numbers including zero and their negatives. It explains that positive integers are whole numbers greater than zero, while negative integers are the opposites of positive integers. The number line is used to demonstrate that integers increase from left to right and how the absolute value of a number is always positive or zero.
033 lesson 21
The document provides lesson objectives and rules for adding integers:
1) When adding integers with the same sign, add their absolute values and use the same sign for the result.
2) When adding integers with opposite signs, take the absolute values, subtract the smaller from the larger, and use the sign of the integer with the larger absolute value for the result.
3) The sum of any integer and its opposite integer is always zero.
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The document discusses different methods for dividing whole numbers, including division with remainders where the answer is not a whole number. It provides examples and steps to show how to calculate division problems and expresses the answer as a quotient with a remainder. Mental division strategies are also described, emphasizing knowing multiplication tables and the order of operations.
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Division is one of the fundamental mathematical operations that is explained in this chapter. It will cover the different parts of division and how it can be used to solve word problems. Mastering division is an important part of learning mathematics.
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