3'5 Ratios and Proportion

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3.5Ratios and Proportion
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• Ratios

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Writing Ratios as Fractions
EXAMPLE
Write the ratio of 7 to 12 as a fraction.
SOLUTION
Remember that order is important while writing
ratios.
is not the same as
Elayn Martin-Gay, PEARSON PRENTICE HALL, BASIC
COLLEGE MATHEMATICS, 3e Slide 5
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Writing Ratios in Simplest Form
EXAMPLE
Write the ratio 25 to 150 as a fraction in its
simplest form.
SOLUTION
Elayn Martin-Gay, PEARSON PRENTICE HALL, BASIC
COLLEGE MATHEMATICS, 3e Slide 6
5

• Rates

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Writing Rates as Fractions
Elayn Martin-Gay, PEARSON PRENTICE HALL, BASIC
COLLEGE MATHEMATICS, 3e Slide 9
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Finding Unit Rates
EXAMPLE
Write 275 miles in 11 hours as a unit rate.
SOLUTION
Elayn Martin-Gay, PEARSON PRENTICE HALL, BASIC
COLLEGE MATHEMATICS, 3e Slide 10
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Finding Unit Prices
EXAMPLE
Find the unit price of 0.87 for 3 apples.
SOLUTION
Elayn Martin-Gay, PEARSON PRENTICE HALL, BASIC
COLLEGE MATHEMATICS, 3e Slide 11
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Proportions
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Writing Proportions
Elayn Martin-Gay, PEARSON PRENTICE HALL, BASIC
COLLEGE MATHEMATICS, 3e Slide 14
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Determining Whether Proportions Are True
EXAMPLE
Determine whether is a true
proportion by cross multiplying.
Elayn Martin-Gay, PEARSON PRENTICE HALL, BASIC
COLLEGE MATHEMATICS, 3e Slide 15
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Classwork/Homework