Estimation and Rounding — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Estimate using compatible numbers: 598 divided by 6 is approximately 100.
600 divided by 6 equals 100, which is a reasonable estimate of 598 divided by 6.
2. Estimate: 412 divided by 7 is approximately 60.
420 divided by 7 equals 60, giving a quick estimate of the actual quotient.
3. Estimate: 729 divided by 9 is approximately 80.
720 divided by 9 equals 80, which is close to the true quotient of 81.
4. Estimate: 318 divided by 4 is approximately 80.
320 divided by 4 equals 80, a clean compatible-number estimate.
5. Estimate: 248 divided by 5 is approximately 50.
250 divided by 5 equals 50, which is approximately equal to the quotient.
6. Estimate: 561 divided by 8 is approximately 70.
560 divided by 8 equals 70, giving a reasonable estimate.
7. Estimate: 487 divided by 7 is approximately 70.
490 divided by 7 equals 70, which is close to the actual answer.
8. Estimate: 632 divided by 9 is approximately 70.
630 divided by 9 equals 70, a clean compatible-number quotient.
9. Estimate: 358 divided by 6 is approximately 60.
360 divided by 6 equals 60, an easy compatible-number 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 of 295 divided by 5
→ 60
60
Estimate of 482 divided by 8
→ 60
80
Estimate of 718 divided by 9
→ 80
90
Estimate of 647 divided by 7
→ 90
100
295 divided by 5 is about 300 divided by 5 = 60. 482 divided by 8 is about 480 divided by 8 = 60. 718 divided by 9 is about 720 divided by 9 = 80. 647 divided by 7 is about 630 divided by 7 = 90.