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Big Ideas Math: Modeling Real Life, Grade 7

BI

Big Ideas Math: Modeling Real Life, Grade 7 View details

3. Identifying Proportional Relationships

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Exercise 5 Page 197

You can use cross products to determine if the ratios are equivalent.

No.

Practice makes perfect

To determine if the given ratios form a proportion. Let's first write them as fractions. ccc Ratio & & Fraction [0.8em] 6: 2 & → & 6/2 [1em] 12: 1 & → & 12/1 Then, we will set them equal to one another and use the Cross Products Property. If the resulting equation is true, then the ratios form a proportion.

6/2? =12/1

Cross multiply

6* 1? =2* 12

Multiply

6≠ 24 *

No, the ratios do not form a proportion because the cross products are not equal.

Subchapter links

Try It p.196-198

Self-Assessment for Concept & Skills p.198

Self-Assessment for Problem Solving p.199

Review & Refresh p.200

Concept, Skills, & Problem Solving p.200-202