Year 5 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 3 — Answers
Answer sheet with worked solutions for the Year 5 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 5 · Mathematics · Place ValueYear 5 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 517 − 233 by rounding each number to the nearest 100.
Answer: 300
- 517 rounds to 500; 233 rounds to 200
- 500 − 200 = 300
The exact answer is 284, close to the estimate.
2.Estimate 45 × 8 by rounding 45 to the nearest 10.
Answer: 400
- 45 rounds to 50
- 50 × 8 = 400
The exact answer is 360.
3.Estimate 826 + 916 by rounding each number to the nearest 100.
Answer: 1,700
- 826 rounds to 800; 916 rounds to 900
- 800 + 900 = 1,700
The exact answer is 1,742, close to the estimate.
4.Estimate 25 × 6 by rounding 25 to the nearest 10.
Answer: 180
- 25 rounds to 30
- 30 × 6 = 180
The exact answer is 150.
5.Estimate 679 − 211 by rounding each number to the nearest 100.
Answer: 500
- 679 rounds to 700; 211 rounds to 200
- 700 − 200 = 500
The exact answer is 468, close to the estimate.
6.Estimate 91 × 6 by rounding 91 to the nearest 10.
Answer: 540
- 91 rounds to 90
- 90 × 6 = 540
The exact answer is 546.
7.Estimate 529 + 639 by rounding each number to the nearest 100.
Answer: 1,100
- 529 rounds to 500; 639 rounds to 600
- 500 + 600 = 1,100
The exact answer is 1,168, close to the estimate.
8.Estimate 42 × 8 by rounding 42 to the nearest 10.
Answer: 320
- 42 rounds to 40
- 40 × 8 = 320
The exact answer is 336.
9.Estimate 603 − 183 by rounding each number to the nearest 100.
Answer: 400
- 603 rounds to 600; 183 rounds to 200
- 600 − 200 = 400
The exact answer is 420, close to the estimate.
10.Estimate 11 × 7 by rounding 11 to the nearest 10.
Answer: 70
- 11 rounds to 10
- 10 × 7 = 70
The exact answer is 77.
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.