4th Grade Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 3 — Answers
Answer sheet with worked solutions for the 4th Grade place value worksheet.
Success TutoringWorksheetsAnswer sheet4th Grade · Mathematics · Place Value4th Grade 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 74 − 23 by rounding each number to the nearest 10.
Answer: 50
- 74 rounds to 70; 23 rounds to 20
- 70 − 20 = 50
The exact answer is 51, close to the estimate.
2.Estimate 35 + 51 by rounding each number to the nearest 10.
Answer: 90
- 35 rounds to 40; 51 rounds to 50
- 40 + 50 = 90
The exact answer is 86, close to the estimate.
3.Estimate 78 + 72 by rounding each number to the nearest 10.
Answer: 150
- 78 rounds to 80; 72 rounds to 70
- 80 + 70 = 150
The exact answer is 150, close to the estimate.
4.Estimate 41 + 54 by rounding each number to the nearest 10.
Answer: 90
- 41 rounds to 40; 54 rounds to 50
- 40 + 50 = 90
The exact answer is 95, close to the estimate.
5.Estimate 82 − 74 by rounding each number to the nearest 10.
Answer: 10
- 82 rounds to 80; 74 rounds to 70
- 80 − 70 = 10
The exact answer is 8, close to the estimate.
6.Estimate 61 − 26 by rounding each number to the nearest 10.
Answer: 30
- 61 rounds to 60; 26 rounds to 30
- 60 − 30 = 30
The exact answer is 35, close to the estimate.
7.Estimate 38 + 28 by rounding each number to the nearest 10.
Answer: 70
- 38 rounds to 40; 28 rounds to 30
- 40 + 30 = 70
The exact answer is 66, close to the estimate.
8.Estimate 81 + 13 by rounding each number to the nearest 10.
Answer: 90
- 81 rounds to 80; 13 rounds to 10
- 80 + 10 = 90
The exact answer is 94, close to the estimate.
9.Estimate 63 + 23 by rounding each number to the nearest 10.
Answer: 80
- 63 rounds to 60; 23 rounds to 20
- 60 + 20 = 80
The exact answer is 86, close to the estimate.
10.Estimate 19 + 75 by rounding each number to the nearest 10.
Answer: 100
- 19 rounds to 20; 75 rounds to 80
- 20 + 80 = 100
The exact answer is 94, 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.