SUBTRACTING a NUMBER Is the Same As ADDING Its OPPOSITE!

Assignment # ___ – Adding and Subtracting (Opposites) Name ______

Standard: NS 1.2 Add and Subtract Integers Pre-Algebra, Period ______

Date ______

ADDING a NEGATIVE number is the same as SUBTRACTING the OPPOSITE of the number! 7 + (–8) = 7 – 8 which equals –1

SUBTRACTING a NUMBER is the same as ADDING its OPPOSITE! 7 – 8 = 7 + (–8) which equals –1 9 – (–9) = 9 + 9 which equals 18 ------

Rewrite to demonstrate how each expression can be written two ways.

Two signs One Sign What’s the sum?

Example: 40 + (–20) = 40 –20 20

1. 19 + (–6) = ______

2. ______= 30 – 18 ______

3. ______= 12 – 17 ______

4. 8 + (–90) = ______

Rewrite each subtraction as addition of the opposite, then evaluate.

Subtract Add opposite Result

Example: 3 – 10 = 3 + (–10) = –7

5. –2 – 8 = ______= ______

6. 4 – 7 = ______= ______

7. 12 – (–18) = ______= ______

8. –6 – (–9) = ______= ______

Bonus: 9. 8 1 10. 4 8 5 1 4 2 2 6