Glencoe Math: Course 3, Volume 1
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Exercise 4 Page 170

Instead of subtracting a negative number, you can add.

-4

Practice makes perfect
Let's perform the subtraction.
-6-(-2)
-6+2
-4

We can see that subtracting a negative number is the same as adding its positive counterpart. Below we will demonstrate by finding -6 and moving 2 units to the right on the number line.

The resulting position, after moving to the right on the number line, is the subtraction. -6-(-2)=-4