5th Grade Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 3 — Answers
Answer sheet with worked solutions for the 5th Grade place value worksheet.
Success TutoringWorksheetsAnswer sheet5th Grade · Mathematics · Place Value5th Grade Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 3 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 227 + 217 by rounding each number to the nearest 100.
Answer: 400
- 227 rounds to 200; 217 rounds to 200
- 200 + 200 = 400
The exact answer is 444, close to the estimate.
2.Estimate 66 × 8 by rounding 66 to the nearest 10.
Answer: 560
- 66 rounds to 70
- 70 × 8 = 560
The exact answer is 528.
3.Estimate 942 + 864 by rounding each number to the nearest 100.
Answer: 1,800
- 942 rounds to 900; 864 rounds to 900
- 900 + 900 = 1,800
The exact answer is 1,806, close to the estimate.
4.Estimate 14 × 5 by rounding 14 to the nearest 10.
Answer: 50
- 14 rounds to 10
- 10 × 5 = 50
The exact answer is 70.
5.Estimate 964 − 830 by rounding each number to the nearest 100.
Answer: 200
- 964 rounds to 1,000; 830 rounds to 800
- 1,000 − 800 = 200
The exact answer is 134, close to the estimate.
6.Estimate 11 × 7 by rounding 11 to the nearest 10.
Answer: 70
- 11 rounds to 10
- 10 × 7 = 70
The exact answer is 77.
7.Estimate 688 − 355 by rounding each number to the nearest 100.
Answer: 300
- 688 rounds to 700; 355 rounds to 400
- 700 − 400 = 300
The exact answer is 333, close to the estimate.
8.Estimate 55 × 9 by rounding 55 to the nearest 10.
Answer: 540
- 55 rounds to 60
- 60 × 9 = 540
The exact answer is 495.
9.Estimate 740 − 366 by rounding each number to the nearest 100.
Answer: 300
- 740 rounds to 700; 366 rounds to 400
- 700 − 400 = 300
The exact answer is 374, close to the estimate.
10.Estimate 16 × 5 by rounding 16 to the nearest 10.
Answer: 100
- 16 rounds to 20
- 20 × 5 = 100
The exact answer is 80.
Marking tips
- Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
- For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
- Celebrate what went well first, then pick one thing to work on next.