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Rules
for Adding:
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When you add two numbers with the
same signs, |
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1. add the absolute values, and
2. write the sum (the answer) with the sign of the numbers.
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When you add two numbers with
different signs,
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1. subtract the absolute values, and
2. write the difference (the answer) with the sign of the number
having the larger
absolute value. |
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Examples:
Add :
| 1. -9 + (-7) =
-16 |
5. 6 + (-2) =
4 |
| 2. –20 + 15 =
-5
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6. (-21) + 21 =
0 |
| 3. (-23) +
(-7) = -30 |
7. –3 + 8 =
5 |
| 4. (+3) + (+5) =
8
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8. -9 + 6 =
-3 |
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9. Add -9 and -5. Answer: -14
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10. Add (-7), (+3), and (-12). Answer: -16
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