Glencoe Math: Course 3, Volume 1
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Exercise 6 Page 170

Instead of subtracting a negative number, you can add.

-2

Practice makes perfect
Let's perform the subtraction.
-5-(-3)
-5+3
-2

We can see that subtracting a negative number is the same as adding its positive counterpart. Below we will demonstrate by finding -5 and moving 3 units to the right on the number line.

The resulting position, after moving to the right on the number line, is the subtraction. -5-(-3)=-2