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Arithmetic Operations with Negative and Positive Numbers Review


Adding Real Numbers:

Positive + Positive = Positive
5 + 3 = 8
Negative + Negative = Negative
(- 6) + (- 3) = - 9

Sum of a negative and a positive number

Keep the sign of the larger number and subtract

(- 6) + 3 = -3

9 + (-12) = - 3

(- 5) + 7 = 2

4 + ( -2) = 2.

Subtracting Real Numbers:

Negative - Positive = Negative (same as adding two negative numbers)
(- 8) - 3 = -8 + (-3) = -11
Positive - Negative = Positive + Positive = Positive
4 - (-3) = 4 + 3 = 7

Negative - Negative = Negative + Positive =

Keep the sign of the larger number and subtract

(-7) - (-5) = ( -7) + 5 = -2

(-5) - ( -7) = (-5) + 7 = 2

Multiplying Real Numbers:

Positive x Positive = Positive 3 x 4 = 12
Negative x Negative = Positive (-3) x (-5) = 15
Negative x Positive = Negative (-3) x 2 = -6
Positive x Negative = Negative 3 x (-2) = -6

Dividing Real Numbers:

Positive ÷ Positive = Positive 18 ÷ 3 = 6
Negative ÷ Negative = Positive (-18) ÷ (-3) = 6
Negative ÷ Positive = Negative (-18) ÷ 3 = -6
Positive ÷ Negative = Negative 18 ÷ (-3) = -6.

 


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