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
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
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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
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
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