Year 4 Estimating Sums, Differences and Products Worksheet — Level 1 — 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 1 — Practice Set 3 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 81 + 79 by rounding each number to the nearest 10.
Answer: 160
- 81 rounds to 80; 79 rounds to 80
- 80 + 80 = 160
The exact answer is 160, close to the estimate.
2.Estimate 84 + 72 by rounding each number to the nearest 10.
Answer: 150
- 84 rounds to 80; 72 rounds to 70
- 80 + 70 = 150
The exact answer is 156, close to the estimate.
3.Estimate 54 + 36 by rounding each number to the nearest 10.
Answer: 90
- 54 rounds to 50; 36 rounds to 40
- 50 + 40 = 90
The exact answer is 90, close to the estimate.
4.Estimate 73 + 48 by rounding each number to the nearest 10.
Answer: 120
- 73 rounds to 70; 48 rounds to 50
- 70 + 50 = 120
The exact answer is 121, close to the estimate.
5.Estimate 39 + 27 by rounding each number to the nearest 10.
Answer: 70
- 39 rounds to 40; 27 rounds to 30
- 40 + 30 = 70
The exact answer is 66, close to the estimate.
6.Estimate 37 − 32 by rounding each number to the nearest 10.
Answer: 10
- 37 rounds to 40; 32 rounds to 30
- 40 − 30 = 10
The exact answer is 5, close to the estimate.
7.Estimate 97 + 74 by rounding each number to the nearest 10.
Answer: 170
- 97 rounds to 100; 74 rounds to 70
- 100 + 70 = 170
The exact answer is 171, close to the estimate.
8.Estimate 44 − 28 by rounding each number to the nearest 10.
Answer: 10
- 44 rounds to 40; 28 rounds to 30
- 40 − 30 = 10
The exact answer is 16, close to the estimate.
9.Estimate 89 − 18 by rounding each number to the nearest 10.
Answer: 70
- 89 rounds to 90; 18 rounds to 20
- 90 − 20 = 70
The exact answer is 71, close to the estimate.
10.Estimate 43 − 29 by rounding each number to the nearest 10.
Answer: 10
- 43 rounds to 40; 29 rounds to 30
- 40 − 30 = 10
The exact answer is 14, 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.