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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 8 Page 200

Instead of subtracting a negative number, you can add.

-3

Practice makes perfect

Let's perform the subtraction.

- 17 - (- 14)

a-(- b)=a+b

- 17 + 14

Add terms

- 3

We can see that subtracting a negative number is the same as adding its positive counterpart. Below we will demonstrate by finding -17 and moving 14 units to the right on the number line.

The resulting position, after moving to the right on the number line, is the sum. -17 -(-14) = -3

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