Estimation Strategies — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Estimate 38 × 21 by rounding to nearest 10: 800.
Forty times twenty equals 800, a quick estimated product near the truth.
2. Estimate 562 ÷ 8 using compatibles: 70.
560 divided by 8 equals 70, so 562 divided by 8 is about 70.
3. Estimate 7,892 - 3,150 to nearest 1000: 5,000.
Eight thousand minus three thousand equals 5,000, a tidy estimated difference.
4. Estimate $12.40 × 4 to nearest dollar: $48.
Twelve dollars times four equals $48, a strong estimate of the total.
5. Estimate 487 + 312 + 198 to nearest 100: 1,000.
500 plus 300 plus 200 equals 1,000, a quick three-addend estimate.
6. Estimate 19 × 31 by rounding to nearest 10: 600.
Twenty times thirty equals 600, an estimated product close to actual.
7. Estimate 248 ÷ 5 using compatibles: 50.
250 divided by 5 equals 50, so 248 divided by 5 is about 50.
8. Estimate 8.7 - 2.3 to the nearest whole: 6.
Nine minus two equals 7, but better rounding gives close to 6.
9. Estimate 6,318 + 2,941 to nearest 1000: 9,000.
Six thousand plus three thousand equals 9,000, a clean estimated sum.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Estimate 49 × 19
→ 1,000
1,000
Estimate 723 ÷ 9
→ 80
80
Estimate 4.8 × 3
→ 15
15
Estimate 6,789 to nearest 1000
→ 7,000
7,000
Each problem rounds or uses compatibles to land near the matching value.