7th Grade · The Number System
Sum
7.NS.A.1b
Definition
The result of addition. Same signs: add the absolute values and keep the sign. Different signs: subtract the absolute values and use the sign of the larger.
Examples
- (-3) + (-5) = -8 (same signs).
- (-7) + 4 = -3 (different signs).
Key rule
Find the absolute values first, then apply the sign rule.
Memory hook
Same signs add, different signs subtract.