Estimation Strategies — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Estimate 623 ÷ 7 using compatibles: 90.
630 divided by 7 equals 90, so 623 divided by 7 is about 90.
2. Estimate 412 + 589 to the nearest 100: 1,000.
Four hundred plus six hundred equals 1,000, a tidy estimated sum.
3. Estimate 81 ÷ 9 using compatibles: 9.
Because 9 times 9 equals 81, the quotient is exactly 9 with no rounding.
4. Estimate 2,387 + 4,612 to the nearest 1000: 7,000.
Two thousand plus five thousand equals 7,000, an easy estimated sum.
5. Estimate $48.20 + $31.75 to the nearest dollar: $80.
$48 plus $32 equals $80, providing a quick estimate of total cost.
6. Estimate 718 - 293 to the nearest 100: 400.
Seven hundred minus three hundred equals 400, a quick estimated difference.
7. Estimate 358 ÷ 6 using compatibles: 60.
360 divided by 6 equals 60, so 358 divided by 6 is about 60.
8. Estimate 4.8 + 3.2 to the nearest whole: 8.
Five plus three equals 8, a sensible estimate near the actual sum.
9. Estimate 567 - 123 to the nearest 10: 450.
Five hundred seventy minus one hundred twenty equals 450 as the estimate.
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 482 + 319
→ 800
800
Estimate 71 ÷ 8
→ 9
9
Estimate 6.2 + 2.9
→ 9.1
9.1
Estimate 4,873 to nearest 1000
→ 5,000
5,000
Each estimate uses rounding or compatibles to reach the matching listed value.