7th Grade · Expressions & Equations
Estimation
7.EE.B.3
Definition
Finding an approximate answer by rounding or simplifying numbers. Use ≈ (approximately equal to). Helps check if an exact answer is reasonable.
Examples
- 48 × 19 ≈ 50 × 20 = 1,000; exact answer 912 is close.
- 362 + 489 ≈ 300 + 400 = 700 (front-end estimation).
Key rule
A good estimate is close to the exact answer but simpler to calculate.
Memory hook
Round first, then sanity-check the exact answer.