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Lesson 85 Warm Up Pg. 441
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Using Cross Products to Solve Proportions
Course 1 Lesson 85 Using Cross Products to Solve Proportions
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Cross Products One way to compare fractions is by determining whether two fractions have equal cross products. The cross products of two fractions are found by cross multiplication. 3 6 4 8 3 x 8 = x 6 = 24. The cross products are 24, so the fractions are equal. Equal fractions have equal cross products.
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Example 1
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Example 2 Note: If the cross products are the same then the ratios form a proportion.
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Example 3
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Example 4
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Lesson 85 Homework Pg. 443 Practice, #1-10
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