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Big Ideas Math: Modeling Real Life, Grade 7

BI

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

3. Adding Rational Numbers

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Exercise 4 Page 19

When calculating the sum of two numbers with the same sign, we add their absolute values.

- 6

Practice makes perfect

We want to find the sum and simplify the result of the addition. Let's look at the given expression! - 3.3+( - 2.7) Now, we can find the sum of two rational numbers with the same sign. Recall that we can do so by adding their absolute values. Let's do it!

|- 3.3|+|- 2.7|

|-3.3|=3.3

3.3+|- 2.7|

|-2.7|=2.7

3.3+2.7

Add terms

6

Recall that both numbers are negative. This means that the sum is also a negative number, - 6.

Subchapter links

Try It p.18-19

Self-Assessment for Concept & Skills p.19

Self-Assessment for Problem Solving p.20

Review & Refresh p.21

Concept, Skills, & Problem Solving p.21-22