Year 5 Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 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 3 — Practice Set 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 3,547 + 4,785 by rounding each number to the nearest 1,000.
Answer: 9,000
- 3,547 rounds to 4,000; 4,785 rounds to 5,000
- 4,000 + 5,000 = 9,000
The exact answer is 8,332, close to the estimate.
2.Estimate 53 × 43 by rounding each number to the nearest 10.
Answer: 2,000
- 53 rounds to 50; 43 rounds to 40
- 50 × 40 = 2,000
The exact answer is 2,279.
3.Estimate 23 × 32 by rounding each number to the nearest 10.
Answer: 600
- 23 rounds to 20; 32 rounds to 30
- 20 × 30 = 600
The exact answer is 736.
4.Estimate 8,328 − 6,399 by rounding each number to the nearest 100.
Answer: 1,900
- 8,328 rounds to 8,300; 6,399 rounds to 6,400
- 8,300 − 6,400 = 1,900
The exact answer is 1,929, close to the estimate.
5.Estimate 92 × 59 by rounding each number to the nearest 10.
Answer: 5,400
- 92 rounds to 90; 59 rounds to 60
- 90 × 60 = 5,400
The exact answer is 5,428.
6.Estimate 48 × 24 by rounding each number to the nearest 10.
Answer: 1,000
- 48 rounds to 50; 24 rounds to 20
- 50 × 20 = 1,000
The exact answer is 1,152.
7.Estimate 8,692 + 8,279 by rounding each number to the nearest 1,000.
Answer: 17,000
- 8,692 rounds to 9,000; 8,279 rounds to 8,000
- 9,000 + 8,000 = 17,000
The exact answer is 16,971, close to the estimate.
8.Estimate 97 × 19 by rounding each number to the nearest 10.
Answer: 2,000
- 97 rounds to 100; 19 rounds to 20
- 100 × 20 = 2,000
The exact answer is 1,843.
9.Estimate 82 × 5 by rounding 82 to the nearest 10.
Answer: 400
- 82 rounds to 80
- 80 × 5 = 400
The exact answer is 410.
10.Estimate 5,515 − 2,741 by rounding each number to the nearest 100.
Answer: 2,800
- 5,515 rounds to 5,500; 2,741 rounds to 2,700
- 5,500 − 2,700 = 2,800
The exact answer is 2,774, close to the estimate.
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.