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Pearson Algebra 1 Common Core, 2011

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Pearson Algebra 1 Common Core, 2011 View details

5. Adding and Subtracting Real Numbers

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Exercise 20 Page 34

Instead of adding a negative number, you can subtract.

3

Practice makes perfect

Let's perform the addition.

12+(-9)

a+(- b)=a-b

12-9

Subtract term

3

We can see that adding a negative number is the same as subtracting its positive counterpart. Below we will demonstrate by finding 12 and moving 9 units to the left on the number line.

The resulting position after moving to the left on the number line is the sum. 12+(-9)=3

Subchapter links

Lesson Check p.33

Practice and Problem-Solving Exercises p.34-36

Standardized Test Prep p.36

Mixed Review p.36