1. If the integers have like signs,
then add and keep the sign.
Positive plus positive equals positive

12 + 9 = 21
2. If the integers have opposite signs, then subtract
them and keep the sign of the largest.
Positive plus Negative or Negative plus Positive
12 + -9 = 3
-21 + 13 = -8
Subtract & sign of largest
Subtract & sign of largest
(12-9 = 3) & (largest positive 12) (21-13 = 8) & (largest negative 21)
Negative plus negative equals negative

-11 + -8 = -19
11 + -31 = -20
-4 + 28 = 24
Subtract & sign of largest
Subtract & sign of largest
(31-11=20)&(largest negative 31) (28-4=24)& (largest positive 28)
“Dealing with Subtraction”

-11 – 24 = -35
“Dealing with Subtraction”

Negative and minus, same sign.
Positive and minus, opposite signs
Subtract & sign of largest
(24-8=16) & (largest negative 24)
Now, add and keep the sign.
4 – -13 = 17

Double negative becomes plus
4 + +13 = 17
Now, add and keep the sign.
8 – 24 = -16

-7 – -18 = 11
Double negative becomes positive
-7 + +18 = 11
Now, opposite signs
Subtract & sign of largest
(18-7=11) & (largest positive 18)
1. If the signs are the same, then the product
quotient is positive.
Multiplication
Division
2. If the signs are opposite, then the product or
quotient is negative.
Multiplication
Division