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. |