Unit 3 Using Fractions and Percentages

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


Addition and Subtraction of Fractions

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

Example:

(or )

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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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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Compound Interest

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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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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Documents

Unit 3 Using Fractions and Percentages