Year 5 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 4 — 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 4 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 838 − 722 by rounding each number to the nearest 100.
Answer: 100
- 838 rounds to 800; 722 rounds to 700
- 800 − 700 = 100
The exact answer is 116, close to the estimate.
2.Estimate 22 × 7 by rounding 22 to the nearest 10.
Answer: 140
- 22 rounds to 20
- 20 × 7 = 140
The exact answer is 154.
3.Estimate 499 − 322 by rounding each number to the nearest 100.
Answer: 200
- 499 rounds to 500; 322 rounds to 300
- 500 − 300 = 200
The exact answer is 177, close to the estimate.
4.Estimate 97 × 3 by rounding 97 to the nearest 10.
Answer: 300
- 97 rounds to 100
- 100 × 3 = 300
The exact answer is 291.
5.Estimate 796 + 582 by rounding each number to the nearest 100.
Answer: 1,400
- 796 rounds to 800; 582 rounds to 600
- 800 + 600 = 1,400
The exact answer is 1,378, close to the estimate.
6.Estimate 51 × 5 by rounding 51 to the nearest 10.
Answer: 250
- 51 rounds to 50
- 50 × 5 = 250
The exact answer is 255.
7.Estimate 201 + 432 by rounding each number to the nearest 100.
Answer: 600
- 201 rounds to 200; 432 rounds to 400
- 200 + 400 = 600
The exact answer is 633, close to the estimate.
8.Estimate 69 × 5 by rounding 69 to the nearest 10.
Answer: 350
- 69 rounds to 70
- 70 × 5 = 350
The exact answer is 345.
9.Estimate 781 + 639 by rounding each number to the nearest 100.
Answer: 1,400
- 781 rounds to 800; 639 rounds to 600
- 800 + 600 = 1,400
The exact answer is 1,420, close to the estimate.
10.Estimate 12 × 3 by rounding 12 to the nearest 10.
Answer: 30
- 12 rounds to 10
- 10 × 3 = 30
The exact answer is 36.
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.