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Unit 3Using 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

Unit 3Using Fractions and Percentages

- Addition and Subtraction of Fractions

- When adding or subtracting fractions, you must

have the same denominator. - Example

Lowest common multiple of 4 and 5 is 20

- When adding or subtracting fractions, you must

have the same denominator. - Example

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Addition and Subtraction of FractionsPlease

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Presentation 2 Multiplication and Division of Fractions

Presentation 3 Compound Interest

Presentation 4 Reverse Percentage Problem

Unit 3Using Fractions and Percentages

- Multiplication and Division of Fractions

- The rule is
- Example

3 is a common factor in both the numerator and

denominator

The rule is Example

- Example
- First Calculate
- Thus

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Multiplication and Division of FractionsPlease

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Presentation 1 Addition and Subtraction of Fractions

Presentation 3 Compound Interest

Presentation 4 Reverse Percentage Problem

Unit 3Using Fractions and Percentages

- Compound Interest

When An is the total amount after investing A0

for n years at r

- How much is 140 worth after 10 years in an

account that pays 5 interest per year

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Presentation 1 Addition and Subtraction of Fractions

Presentation 2 Multiplication and Division of Fractions

Presentation 4 Reverse Percentage Problem

Unit 3Using Fractions and Percentages

- Reverse Percentage Problem

- 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 ProblemPlease choose an

option

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Presentation 1 Addition and Subtraction of Fractions

Presentation 2 Multiplication and Division of Fractions

Presentation 3 Compound Interest