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Big Ideas Math: Modeling Real Life, Grade 7

BI

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

5. Subtracting Rational Numbers

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Exercise 18 Page 34

Subtracting a number is the same as adding its opposite.

- 8.13

Practice makes perfect

We want to find the difference. Let's look at the given expression! - 4.62- 3.51We can recall that subtracting a number is the same as adding its opposite. - 4.62- 3.51= - 4.62+(- 3.51) Now, we can find the sum of two numbers with the same sign. We can do so by finding the sum of their absolute values.

|- 4.62|+|- 3.51|

|-4.62|=4.62

4.62+|- 3.51|

|-3.51|=3.51

4.62+3.51

Add terms

8.13

Notice that both numbers in our sum expression have a negative sign. This means that the difference between - 4.62 and 3.51 is also a negative number, - 8.13.

Subchapter links

Try It p.30-32

Self-Assessment for Concept & Skills p.32

Self-Assessment for Problem Solving p.33

Review & Refresh p.34

Concept, Skills, & Problem Solving p.34-36