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 7,760 − 6,974 by rounding each number to the nearest 100.
Answer: 800
- 7,760 rounds to 7,800; 6,974 rounds to 7,000
- 7,800 − 7,000 = 800
The exact answer is 786, close to the estimate.
2.Estimate 54 × 56 by rounding each number to the nearest 10.
Answer: 3,000
- 54 rounds to 50; 56 rounds to 60
- 50 × 60 = 3,000
The exact answer is 3,024.
3.Estimate 41 × 5 by rounding 41 to the nearest 10.
Answer: 200
- 41 rounds to 40
- 40 × 5 = 200
The exact answer is 205.
4.Estimate 2,027 + 1,418 by rounding each number to the nearest 100.
Answer: 3,400
- 2,027 rounds to 2,000; 1,418 rounds to 1,400
- 2,000 + 1,400 = 3,400
The exact answer is 3,445, close to the estimate.
5.Estimate 91 × 54 by rounding each number to the nearest 10.
Answer: 4,500
- 91 rounds to 90; 54 rounds to 50
- 90 × 50 = 4,500
The exact answer is 4,914.
6.Estimate 31 × 6 by rounding 31 to the nearest 10.
Answer: 180
- 31 rounds to 30
- 30 × 6 = 180
The exact answer is 186.
7.Estimate 4,763 − 2,580 by rounding each number to the nearest 100.
Answer: 2,200
- 4,763 rounds to 4,800; 2,580 rounds to 2,600
- 4,800 − 2,600 = 2,200
The exact answer is 2,183, close to the estimate.
8.Estimate 77 × 66 by rounding each number to the nearest 10.
Answer: 5,600
- 77 rounds to 80; 66 rounds to 70
- 80 × 70 = 5,600
The exact answer is 5,082.
9.Estimate 89 × 4 by rounding 89 to the nearest 10.
Answer: 360
- 89 rounds to 90
- 90 × 4 = 360
The exact answer is 356.
10.Estimate 4,529 − 3,277 by rounding each number to the nearest 100.
Answer: 1,200
- 4,529 rounds to 4,500; 3,277 rounds to 3,300
- 4,500 − 3,300 = 1,200
The exact answer is 1,252, 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.