Lesson 85 Warm Up Pg. 441.

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Presentation transcript:

Lesson 85 Warm Up Pg. 441

Using Cross Products to Solve Proportions Course 1 Lesson 85 Using Cross Products to Solve Proportions

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 = 24 4 x 6 = 24. The cross products are 24, so the fractions are equal. Equal fractions have equal cross products.

Example 1

Example 2 Note: If the cross products are the same then the ratios form a proportion.

Example 3

Example 4

Lesson 85 Homework Pg. 443 Practice, #1-10