-20 + -80 = -100
Negative plus negative equals
A negative plus negative sign is equal to a negative sign
For example, negative 20 plus negative 80 is equal to negative 100
Addition rules for positive and negative numbers
1. Two same signs – (Add the numbers)
20 + 80 = 100
-20 + -80 = -100
Summary
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+ |
+ |
+ |
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– |
– |
2. Two different signs – (Subtract the numbers)
For example:
20 + -80 = -60
-20 + 80 = 60
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