Do Now If Sara can jog 2/3 of a mile in 1/3 of an hour, how many miles can she jog in one hour?

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Presentation transcript:

Do Now If Sara can jog 2/3 of a mile in 1/3 of an hour, how many miles can she jog in one hour?

September 27, 2013 Finding Equivalent Ratios Essential Question: How do you use cross products and division to identify proportional relationships?

Cross Products Cross product of two ratios is the product of the numerator of one ratio and the denominator of the other ratio.

Determine if ratios form a proportion 9 6 51 34 Determine if ratios form a proportion

Determine if ratios form a proportion 12 32 20 50 Determine if ratios form a proportion

Cross Product Property Remember b≠ 0 and d≠0. Why?

Use Division to test for Ratio Equivalency 2 = 8 3 12

Let’s Try Another Problem 2.5 = 4 5 9

Food: You can buy 3 medium pizzas at The Pizza Place for $18 or 5 medium pizzas for $30. Are these offers equivalent?

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Describe the two ways to finding equivalent ratios. Cross Products Dividing the fractions into decimals