The document outlines four presentations that are part of Unit 3 on Using Fractions and Percentages. Presentation 1 covers addition and subtraction of fractions. Presentation 2 discusses multiplication and division of fractions. Presentation 3 is about compound interest and how to calculate total amounts over time. Presentation 4 addresses reverse percentage problems and removing sales tax or other percentages from a total price.

1. Unit 3
Using Fractions and Percentages
Presentation 1 Addition and Subtraction of Fractions
Presentation 2 Multiplication and Division of Fractions
Presentation 3 Compound Interest
Presentation 4 Reverse Percentage Problem

2. Unit 3
Using Fractions and Percentages
Addition and Subtraction of Fractions

3. When adding or subtracting fractions, you
must have the same denominator.
Example:
(or )
Lowest common multiple of
4 and 5 is 20

4. When adding or subtracting fractions, you
must have the same denominator.
Example:

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Addition and Subtraction of Fractions
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Presentation 2 Multiplication and Division of Fractions
Presentation 3 Compound Interest
Presentation 4 Reverse Percentage Problem

6. Unit 3
Using Fractions and Percentages
Multiplication and Division of Fractions

7. The rule is:
Example:
3 is a common factor in both the
numerator and denominator

8. The rule is:
Example:

9. Example:
First Calculate
Thus

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Multiplication and Division of Fractions
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Presentation 1 Addition and Subtraction of Fractions
Presentation 3 Compound Interest
Presentation 4 Reverse Percentage Problem

11. Unit 3
Using Fractions and Percentages
Compound Interest

12. How much is $140 worth after 10 years in
an account that pays 5% interest per year
When An is the total amount after
investing A0 for n years at r%

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Compound Interest
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Presentation 1 Addition and Subtraction of Fractions
Presentation 2 Multiplication and Division of Fractions
Presentation 4 Reverse Percentage Problem

14. Unit 3
Using Fractions and Percentages
Reverse Percentage Problem

15. The price of a computer is $1398, including
GCT at
What was the price of the computer without
GCT?
To add 16.5% GCT, you multiply by 1.165
To remove GCT, you divide by 1.165
Computer price

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Reverse Percentage Problem
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Presentation 1 Addition and Subtraction of Fractions
Presentation 2 Multiplication and Division of Fractions
Presentation 3 Compound Interest