Pre-Algebra Review Topic
Subtracting Signed Numbers
Topic Index | Algebra Index | Regents Exam Prep Center

Rule for Subtracting:
You can subtract a number by adding its opposite.

Examples:      Subtract :

1. | 9 – (- 3) = | 5. | -10 - (-15) =
| 9 + (+3) = 12 | | -10 + (+15) = 5

2.

-7 – (-5) =

6.

-25 - (+25) =

| -7 + (+5) = -2 | | -25 + (-25) = -50

3.

21 – (-19) =

7.

3 - (+5) =

| 21 + (+19) = 40 | | 3 + (-5) = -2

4.

- 5 - 4 =

8.

9 - 3 =

- 5 + (-4) = -9

9 + (-3) = 6

9.   Subtract (-5) from (10).
10 - (-5) = 10 + (+5) = 15

10.   Subtract 4 from (-14).
-14 - 4 = -14 + (-4) = -18

Created by Donna Roberts