Year 5 Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 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 — Practice Set 3 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 9,283 − 4,886 by rounding each number to the nearest 100.
Answer: 4,400
- 9,283 rounds to 9,300; 4,886 rounds to 4,900
- 9,300 − 4,900 = 4,400
The exact answer is 4,397, close to the estimate.
2.Estimate 93 × 32 by rounding each number to the nearest 10.
Answer: 2,700
- 93 rounds to 90; 32 rounds to 30
- 90 × 30 = 2,700
The exact answer is 2,976.
3.Estimate 99 × 31 by rounding each number to the nearest 10.
Answer: 3,000
- 99 rounds to 100; 31 rounds to 30
- 100 × 30 = 3,000
The exact answer is 3,069.
4.Estimate 8,244 − 4,265 by rounding each number to the nearest 100.
Answer: 3,900
- 8,244 rounds to 8,200; 4,265 rounds to 4,300
- 8,200 − 4,300 = 3,900
The exact answer is 3,979, close to the estimate.
5.Estimate 66 × 16 by rounding each number to the nearest 10.
Answer: 1,400
- 66 rounds to 70; 16 rounds to 20
- 70 × 20 = 1,400
The exact answer is 1,056.
6.Estimate 68 × 3 by rounding 68 to the nearest 10.
Answer: 210
- 68 rounds to 70
- 70 × 3 = 210
The exact answer is 204.
7.Estimate 9,869 + 2,038 by rounding each number to the nearest 1,000.
Answer: 12,000
- 9,869 rounds to 10,000; 2,038 rounds to 2,000
- 10,000 + 2,000 = 12,000
The exact answer is 11,907, close to the estimate.
8.Estimate 35 × 39 by rounding each number to the nearest 10.
Answer: 1,600
- 35 rounds to 40; 39 rounds to 40
- 40 × 40 = 1,600
The exact answer is 1,365.
9.Estimate 92 × 15 by rounding each number to the nearest 10.
Answer: 1,800
- 92 rounds to 90; 15 rounds to 20
- 90 × 20 = 1,800
The exact answer is 1,380.
10.Estimate 5,922 + 4,452 by rounding each number to the nearest 100.
Answer: 10,400
- 5,922 rounds to 5,900; 4,452 rounds to 4,500
- 5,900 + 4,500 = 10,400
The exact answer is 10,374, 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.