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 4,940 − 3,919 by rounding each number to the nearest 1,000.
Answer: 1,000
- 4,940 rounds to 5,000; 3,919 rounds to 4,000
- 5,000 − 4,000 = 1,000
The exact answer is 1,021, close to the estimate.
2.Estimate 19 × 48 by rounding each number to the nearest 10.
Answer: 1,000
- 19 rounds to 20; 48 rounds to 50
- 20 × 50 = 1,000
The exact answer is 912.
3.Estimate 96 × 82 by rounding each number to the nearest 10.
Answer: 8,000
- 96 rounds to 100; 82 rounds to 80
- 100 × 80 = 8,000
The exact answer is 7,872.
4.Estimate 2,799 − 2,024 by rounding each number to the nearest 100.
Answer: 800
- 2,799 rounds to 2,800; 2,024 rounds to 2,000
- 2,800 − 2,000 = 800
The exact answer is 775, close to the estimate.
5.Estimate 21 × 45 by rounding each number to the nearest 10.
Answer: 1,000
- 21 rounds to 20; 45 rounds to 50
- 20 × 50 = 1,000
The exact answer is 945.
6.Estimate 62 × 36 by rounding each number to the nearest 10.
Answer: 2,400
- 62 rounds to 60; 36 rounds to 40
- 60 × 40 = 2,400
The exact answer is 2,232.
7.Estimate 9,929 − 7,404 by rounding each number to the nearest 1,000.
Answer: 3,000
- 9,929 rounds to 10,000; 7,404 rounds to 7,000
- 10,000 − 7,000 = 3,000
The exact answer is 2,525, close to the estimate.
8.Estimate 45 × 35 by rounding each number to the nearest 10.
Answer: 2,000
- 45 rounds to 50; 35 rounds to 40
- 50 × 40 = 2,000
The exact answer is 1,575.
9.Estimate 93 × 7 by rounding 93 to the nearest 10.
Answer: 630
- 93 rounds to 90
- 90 × 7 = 630
The exact answer is 651.
10.Estimate 2,267 + 6,675 by rounding each number to the nearest 1,000.
Answer: 9,000
- 2,267 rounds to 2,000; 6,675 rounds to 7,000
- 2,000 + 7,000 = 9,000
The exact answer is 8,942, 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.