Year 3 Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 4 — Answers
Answer sheet with worked solutions for the Year 3 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 3 · Mathematics · Place ValueYear 3 Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 4 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 68 − 41 by rounding each number to the nearest 10.
Answer: 30
- 68 rounds to 70; 41 rounds to 40
- 70 − 40 = 30
The exact answer is 27, close to the estimate.
2.Estimate 75 + 37 by rounding each number to the nearest 10.
Answer: 120
- 75 rounds to 80; 37 rounds to 40
- 80 + 40 = 120
The exact answer is 112, close to the estimate.
3.Estimate 34 + 39 by rounding each number to the nearest 10.
Answer: 70
- 34 rounds to 30; 39 rounds to 40
- 30 + 40 = 70
The exact answer is 73, close to the estimate.
4.Estimate 79 + 21 by rounding each number to the nearest 10.
Answer: 100
- 79 rounds to 80; 21 rounds to 20
- 80 + 20 = 100
The exact answer is 100, close to the estimate.
5.Estimate 61 − 31 by rounding each number to the nearest 10.
Answer: 30
- 61 rounds to 60; 31 rounds to 30
- 60 − 30 = 30
The exact answer is 30, close to the estimate.
6.Estimate 82 + 34 by rounding each number to the nearest 10.
Answer: 110
- 82 rounds to 80; 34 rounds to 30
- 80 + 30 = 110
The exact answer is 116, close to the estimate.
7.Estimate 49 − 43 by rounding each number to the nearest 10.
Answer: 10
- 49 rounds to 50; 43 rounds to 40
- 50 − 40 = 10
The exact answer is 6, close to the estimate.
8.Estimate 97 + 97 by rounding each number to the nearest 10.
Answer: 200
- 97 rounds to 100; 97 rounds to 100
- 100 + 100 = 200
The exact answer is 194, close to the estimate.
9.Estimate 88 + 49 by rounding each number to the nearest 10.
Answer: 140
- 88 rounds to 90; 49 rounds to 50
- 90 + 50 = 140
The exact answer is 137, close to the estimate.
10.Estimate 12 + 52 by rounding each number to the nearest 10.
Answer: 60
- 12 rounds to 10; 52 rounds to 50
- 10 + 50 = 60
The exact answer is 64, 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.