Integer Review

When you add integers with the same sign, keep the sign and add the numbers (ignoring the sign).
 $-5+\left(-3\right)$  

• 8

• -8

• -2

• 2

 $23+90$  

• 83

• 103

• 93

• 113

-19+(-3)

• 16

• 22

• -16

• -22

When considering a subtraction problem, turn it into an addition problem by adding the opposite.

-5-3 becomes

• -5+(-3)

• -5-(-3)

• 5-3

• 5+(-3)

7-8 becomes

• 7+(-8)

• -7+8

• 7-(-8)

• -7+(-8)

-10-7

• -10+(-7)

• -10-(-7)

• 10+(-7)

• 10-(-7)

By this logic, -21-4 is really -21+(-4) which is equal to

• 24

• -17

• -24

• 17

When adding numbers with different signs, we find the difference of the numbers (ignoring their signs) are keep the sign of the larger number.

-8+5

• 3

• -3

• -13

• 13

-5+7

• 2

• -12

• -2

• 12

5+(-10)=

• 5

• 15

• -5

• -15