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 46 + 99 by rounding each number to the nearest 10.
Answer: 150
- 46 rounds to 50; 99 rounds to 100
- 50 + 100 = 150
The exact answer is 145, close to the estimate.
2.Estimate 97 + 55 by rounding each number to the nearest 10.
Answer: 160
- 97 rounds to 100; 55 rounds to 60
- 100 + 60 = 160
The exact answer is 152, close to the estimate.
3.Estimate 67 − 48 by rounding each number to the nearest 10.
Answer: 20
- 67 rounds to 70; 48 rounds to 50
- 70 − 50 = 20
The exact answer is 19, close to the estimate.
4.Estimate 81 + 54 by rounding each number to the nearest 10.
Answer: 130
- 81 rounds to 80; 54 rounds to 50
- 80 + 50 = 130
The exact answer is 135, close to the estimate.
5.Estimate 57 − 19 by rounding each number to the nearest 10.
Answer: 40
- 57 rounds to 60; 19 rounds to 20
- 60 − 20 = 40
The exact answer is 38, close to the estimate.
6.Estimate 19 + 96 by rounding each number to the nearest 10.
Answer: 120
- 19 rounds to 20; 96 rounds to 100
- 20 + 100 = 120
The exact answer is 115, close to the estimate.
7.Estimate 32 − 13 by rounding each number to the nearest 10.
Answer: 20
- 32 rounds to 30; 13 rounds to 10
- 30 − 10 = 20
The exact answer is 19, close to the estimate.
8.Estimate 87 − 46 by rounding each number to the nearest 10.
Answer: 40
- 87 rounds to 90; 46 rounds to 50
- 90 − 50 = 40
The exact answer is 41, close to the estimate.
9.Estimate 85 − 46 by rounding each number to the nearest 10.
Answer: 40
- 85 rounds to 90; 46 rounds to 50
- 90 − 50 = 40
The exact answer is 39, close to the estimate.
10.Estimate 83 + 49 by rounding each number to the nearest 10.
Answer: 130
- 83 rounds to 80; 49 rounds to 50
- 80 + 50 = 130
The exact answer is 132, 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.