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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 10 Page 198

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

Yes.

Practice makes perfect

To determine if the given ratios form a proportion. Let's first write them as fractions. ccc Ratio & & Fraction [0.8em] 9: 3 & → & 9/3 [1em] 45: 15 & → & 45/15 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.

9/3? =45/15

Cross multiply

9* 15? =3* 45

Multiply

135= 135 ✓

Yes, the ratios form a proportion because the cross products are 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