Year 4 Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 3 — Answers
Answer sheet with worked solutions for the Year 4 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 4 · Mathematics · Place ValueYear 4 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 6,512 − 4,930 by rounding each number to the nearest 100.
Answer: 1,600
- 6,512 rounds to 6,500; 4,930 rounds to 4,900
- 6,500 − 4,900 = 1,600
The exact answer is 1,582, close to the estimate.
2.Estimate 31 × 73 by rounding each number to the nearest 10.
Answer: 2,100
- 31 rounds to 30; 73 rounds to 70
- 30 × 70 = 2,100
The exact answer is 2,263.
3.Estimate 32 × 3 by rounding 32 to the nearest 10.
Answer: 90
- 32 rounds to 30
- 30 × 3 = 90
The exact answer is 96.
4.Estimate 2,300 + 7,236 by rounding each number to the nearest 1,000.
Answer: 9,000
- 2,300 rounds to 2,000; 7,236 rounds to 7,000
- 2,000 + 7,000 = 9,000
The exact answer is 9,536, close to the estimate.
5.Estimate 31 × 21 by rounding each number to the nearest 10.
Answer: 600
- 31 rounds to 30; 21 rounds to 20
- 30 × 20 = 600
The exact answer is 651.
6.Estimate 37 × 6 by rounding 37 to the nearest 10.
Answer: 240
- 37 rounds to 40
- 40 × 6 = 240
The exact answer is 222.
7.Estimate 5,417 − 5,316 by rounding each number to the nearest 100.
Answer: 100
- 5,417 rounds to 5,400; 5,316 rounds to 5,300
- 5,400 − 5,300 = 100
The exact answer is 101, close to the estimate.
8.Estimate 66 × 11 by rounding each number to the nearest 10.
Answer: 700
- 66 rounds to 70; 11 rounds to 10
- 70 × 10 = 700
The exact answer is 726.
9.Estimate 13 × 19 by rounding each number to the nearest 10.
Answer: 200
- 13 rounds to 10; 19 rounds to 20
- 10 × 20 = 200
The exact answer is 247.
10.Estimate 7,095 + 9,491 by rounding each number to the nearest 1,000.
Answer: 16,000
- 7,095 rounds to 7,000; 9,491 rounds to 9,000
- 7,000 + 9,000 = 16,000
The exact answer is 16,586, 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.