Year 5 Estimating Sums, Differences and Products Worksheet — Level 3 — 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 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 7,515 − 4,262 by rounding each number to the nearest 1,000.
Answer: 4,000
- 7,515 rounds to 8,000; 4,262 rounds to 4,000
- 8,000 − 4,000 = 4,000
The exact answer is 3,253, close to the estimate.
2.Estimate 32 × 57 by rounding each number to the nearest 10.
Answer: 1,800
- 32 rounds to 30; 57 rounds to 60
- 30 × 60 = 1,800
The exact answer is 1,824.
3.Estimate 74 × 88 by rounding each number to the nearest 10.
Answer: 6,300
- 74 rounds to 70; 88 rounds to 90
- 70 × 90 = 6,300
The exact answer is 6,512.
4.Estimate 5,395 + 7,499 by rounding each number to the nearest 1,000.
Answer: 12,000
- 5,395 rounds to 5,000; 7,499 rounds to 7,000
- 5,000 + 7,000 = 12,000
The exact answer is 12,894, close to the estimate.
5.Estimate 37 × 78 by rounding each number to the nearest 10.
Answer: 3,200
- 37 rounds to 40; 78 rounds to 80
- 40 × 80 = 3,200
The exact answer is 2,886.
6.Estimate 77 × 19 by rounding each number to the nearest 10.
Answer: 1,600
- 77 rounds to 80; 19 rounds to 20
- 80 × 20 = 1,600
The exact answer is 1,463.
7.Estimate 9,733 − 6,818 by rounding each number to the nearest 1,000.
Answer: 3,000
- 9,733 rounds to 10,000; 6,818 rounds to 7,000
- 10,000 − 7,000 = 3,000
The exact answer is 2,915, close to the estimate.
8.Estimate 99 × 93 by rounding each number to the nearest 10.
Answer: 9,000
- 99 rounds to 100; 93 rounds to 90
- 100 × 90 = 9,000
The exact answer is 9,207.
9.Estimate 79 × 95 by rounding each number to the nearest 10.
Answer: 8,000
- 79 rounds to 80; 95 rounds to 100
- 80 × 100 = 8,000
The exact answer is 7,505.
10.Estimate 4,810 − 4,159 by rounding each number to the nearest 100.
Answer: 600
- 4,810 rounds to 4,800; 4,159 rounds to 4,200
- 4,800 − 4,200 = 600
The exact answer is 651, 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.