7th Grade · The Number System
Sign Rules
7.NS.A.2a
Definition
Same signs produce a positive result; different signs produce a negative result. Applies to both multiplication and division of integers.
Examples
- 5 × 3 = 15 and (-5) × (-3) = 15 (same signs, positive).
- 5 × (-3) = -15 and (-5) × 3 = -15 (different signs, negative).
Key rule
Same signs to positive, different signs to negative.
Memory hook
Same = positive, different = negative.