Year 5 Estimating Sums, Differences and Products Worksheet — Level 3 — 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 3 — Practice Set 4 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 4,539 − 2,990 by rounding each number to the nearest 1,000.
Answer: 2,000
- 4,539 rounds to 5,000; 2,990 rounds to 3,000
- 5,000 − 3,000 = 2,000
The exact answer is 1,549, close to the estimate.
2.Estimate 36 × 26 by rounding each number to the nearest 10.
Answer: 1,200
- 36 rounds to 40; 26 rounds to 30
- 40 × 30 = 1,200
The exact answer is 936.
3.Estimate 11 × 8 by rounding 11 to the nearest 10.
Answer: 80
- 11 rounds to 10
- 10 × 8 = 80
The exact answer is 88.
4.Estimate 5,340 − 3,212 by rounding each number to the nearest 1,000.
Answer: 2,000
- 5,340 rounds to 5,000; 3,212 rounds to 3,000
- 5,000 − 3,000 = 2,000
The exact answer is 2,128, close to the estimate.
5.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.
6.Estimate 53 × 55 by rounding each number to the nearest 10.
Answer: 3,000
- 53 rounds to 50; 55 rounds to 60
- 50 × 60 = 3,000
The exact answer is 2,915.
7.Estimate 8,035 − 6,087 by rounding each number to the nearest 100.
Answer: 1,900
- 8,035 rounds to 8,000; 6,087 rounds to 6,100
- 8,000 − 6,100 = 1,900
The exact answer is 1,948, close to the estimate.
8.Estimate 58 × 47 by rounding each number to the nearest 10.
Answer: 3,000
- 58 rounds to 60; 47 rounds to 50
- 60 × 50 = 3,000
The exact answer is 2,726.
9.Estimate 48 × 5 by rounding 48 to the nearest 10.
Answer: 250
- 48 rounds to 50
- 50 × 5 = 250
The exact answer is 240.
10.Estimate 6,427 + 6,925 by rounding each number to the nearest 1,000.
Answer: 13,000
- 6,427 rounds to 6,000; 6,925 rounds to 7,000
- 6,000 + 7,000 = 13,000
The exact answer is 13,352, 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.