Unit 3 Using Fractions and Percentages

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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
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Unit 3Using Fractions and Percentages

• Addition and Subtraction of Fractions

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

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

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

• Multiplication and Division of Fractions

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• The rule is
• Example

3 is a common factor in both the numerator and
denominator
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The rule is Example
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• Example
• First Calculate
• Thus

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

• Compound Interest

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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
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Unit 3Using Fractions and Percentages

• Reverse Percentage Problem

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• 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