|
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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