Integer rules and operations

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1. 
When adding a positive and a positive...
 
Just add the 2 numbers and use the same sign.
 
2. 
+8 + +2 =
 
+10
 
3. 
When adding a positive and a negative...
 
Subtract the 2 numbers and use the sign of the number with the greater absolute value.
 
4. 
+8 + -12 =
 
-4
 
5. 
When subtracting integers...
 
Change the minus sign to addition, and the second integer to its opposite, then follow addition rules. Don't change the first number.
 
6. 
-5 - +16 Changes to what?
 
-5 + -16
 
7. 
-15 - -20 =
 
+5
 
8. 
When multiplying or dividing integers with the same sign the answer is always...
 
positive
 
9. 
When multiplying or dividing integers with different signs the answer is always...
 
negative.
 
10. 
+12 x +3 =
 
+36
 
11. 
-15 x +3 =
 
-45
 
12. 
-20 x -3 =
 
+60
 
13. 
When adding a negative and a negative...
 
Just add the numbers and use the same sign (negative.)
 
14. 
-20 + -3 =
 
-23
 
15. 
-40 / -4 =
 
+10
 
16. 
-35 / +7 =
 
-5
 
17. 

+3x - +2=

(when x = -3)

 
-11
 
18. 

4 - 5a

(when a = -1)

 
+9
 
19. 
x / -10 = 12
 
x = - 120
 
20. 
r + 56 = - 30
 
r = - 86
 
21. 
p - 93 = 12
 
p = 105
 
22. 
6h = -48
 
h = -8