Year 5 Estimating Sums, Differences and Products Worksheet — Level 2 — 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 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 659 + 464 by rounding each number to the nearest 100.
Answer: 1,200
- 659 rounds to 700; 464 rounds to 500
- 700 + 500 = 1,200
The exact answer is 1,123, close to the estimate.
2.Estimate 56 × 8 by rounding 56 to the nearest 10.
Answer: 480
- 56 rounds to 60
- 60 × 8 = 480
The exact answer is 448.
3.Estimate 638 − 502 by rounding each number to the nearest 100.
Answer: 100
- 638 rounds to 600; 502 rounds to 500
- 600 − 500 = 100
The exact answer is 136, close to the estimate.
4.Estimate 67 × 3 by rounding 67 to the nearest 10.
Answer: 210
- 67 rounds to 70
- 70 × 3 = 210
The exact answer is 201.
5.Estimate 892 + 929 by rounding each number to the nearest 100.
Answer: 1,800
- 892 rounds to 900; 929 rounds to 900
- 900 + 900 = 1,800
The exact answer is 1,821, close to the estimate.
6.Estimate 51 × 9 by rounding 51 to the nearest 10.
Answer: 450
- 51 rounds to 50
- 50 × 9 = 450
The exact answer is 459.
7.Estimate 755 − 270 by rounding each number to the nearest 100.
Answer: 500
- 755 rounds to 800; 270 rounds to 300
- 800 − 300 = 500
The exact answer is 485, close to the estimate.
8.Estimate 57 × 3 by rounding 57 to the nearest 10.
Answer: 180
- 57 rounds to 60
- 60 × 3 = 180
The exact answer is 171.
9.Estimate 634 − 517 by rounding each number to the nearest 100.
Answer: 100
- 634 rounds to 600; 517 rounds to 500
- 600 − 500 = 100
The exact answer is 117, close to the estimate.
10.Estimate 33 × 8 by rounding 33 to the nearest 10.
Answer: 240
- 33 rounds to 30
- 30 × 8 = 240
The exact answer is 264.
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.