Glencoe Math: Course 3, Volume 1
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Exercise 5 Page 170

Subtracting can be thought of as going left on the number line.

6

Practice makes perfect
Let's perform the subtraction.
12-6
6

Below we will demonstrate by finding 12 and moving 6 units to the left on the number line.

The resulting position, after moving to the left on the number line, is the subtraction. 12-6=6