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.
Teach it
Where it is taught, with guided notes, practice, homework, an exit ticket and an interactive Teacher Deck.
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.