-31 + -40 = -71
Negative plus negative equals
A negative plus negative sign is equal to a negative sign
For example, negative 31 plus negative 40 is equal to negative 71
Addition rules for positive and negative numbers
1. Two same signs – (Add the numbers)
31 + 40 = 71
-31 + -40 = -71
Summary
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2. Two different signs – (Subtract the numbers)
For example:
31 + -40 = -9
-31 + 40 = 9
Summary
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+ |
– |
– |
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– |
+ |
It is important to be consistent with the signs when adding or subtracting integers.
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NOTE |
| A number with no negative sign at the front is always a positive number |
Negative plus Negative Calculator
Use the calculator below to add two negative numbers