Subtraction of integers can be done without the use of number lines. However, it is important that the concept of addition of integers is very clear. Just remember the addition rules for integers: When adding integers with the same sign, you add their values and copy their sign. When adding integers with different signs, you subtract their values and copy the sign of the larger number.

6. 4
+ (-7)
-3

8. 12
+ (-5)
7

10. -7
+ (-14)
-21

13. 7
+ (10)
17

14. 7
+ (5)
12

15. -10
+ (+14)
4

16. Try it!
Simplify the following:

17. 8
+ (-12)
-4

18. -7
+ (+10)
3