Year 4 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 2 — 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 2 — Practice Set 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 996 − 601 by rounding each number to the nearest 100.
Answer: 400
- 996 rounds to 1,000; 601 rounds to 600
- 1,000 − 600 = 400
The exact answer is 395, close to the estimate.
2.Estimate 39 × 5 by rounding 39 to the nearest 10.
Answer: 200
- 39 rounds to 40
- 40 × 5 = 200
The exact answer is 195.
3.Estimate 937 − 696 by rounding each number to the nearest 100.
Answer: 200
- 937 rounds to 900; 696 rounds to 700
- 900 − 700 = 200
The exact answer is 241, close to the estimate.
4.Estimate 42 × 9 by rounding 42 to the nearest 10.
Answer: 360
- 42 rounds to 40
- 40 × 9 = 360
The exact answer is 378.
5.Estimate 361 + 731 by rounding each number to the nearest 100.
Answer: 1,100
- 361 rounds to 400; 731 rounds to 700
- 400 + 700 = 1,100
The exact answer is 1,092, close to the estimate.
6.Estimate 79 × 9 by rounding 79 to the nearest 10.
Answer: 720
- 79 rounds to 80
- 80 × 9 = 720
The exact answer is 711.
7.Estimate 564 + 997 by rounding each number to the nearest 100.
Answer: 1,600
- 564 rounds to 600; 997 rounds to 1,000
- 600 + 1,000 = 1,600
The exact answer is 1,561, close to the estimate.
8.Estimate 84 × 5 by rounding 84 to the nearest 10.
Answer: 400
- 84 rounds to 80
- 80 × 5 = 400
The exact answer is 420.
9.Estimate 795 − 543 by rounding each number to the nearest 100.
Answer: 300
- 795 rounds to 800; 543 rounds to 500
- 800 − 500 = 300
The exact answer is 252, close to the estimate.
10.Estimate 32 × 7 by rounding 32 to the nearest 10.
Answer: 210
- 32 rounds to 30
- 30 × 7 = 210
The exact answer is 224.
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.