4th Grade Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 4 — 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 4 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 57 + 86 by rounding each number to the nearest 10.
Answer: 150
- 57 rounds to 60; 86 rounds to 90
- 60 + 90 = 150
The exact answer is 143, close to the estimate.
2.Estimate 83 − 31 by rounding each number to the nearest 10.
Answer: 50
- 83 rounds to 80; 31 rounds to 30
- 80 − 30 = 50
The exact answer is 52, close to the estimate.
3.Estimate 91 + 68 by rounding each number to the nearest 10.
Answer: 160
- 91 rounds to 90; 68 rounds to 70
- 90 + 70 = 160
The exact answer is 159, close to the estimate.
4.Estimate 88 − 51 by rounding each number to the nearest 10.
Answer: 40
- 88 rounds to 90; 51 rounds to 50
- 90 − 50 = 40
The exact answer is 37, close to the estimate.
5.Estimate 72 + 83 by rounding each number to the nearest 10.
Answer: 150
- 72 rounds to 70; 83 rounds to 80
- 70 + 80 = 150
The exact answer is 155, close to the estimate.
6.Estimate 37 − 22 by rounding each number to the nearest 10.
Answer: 20
- 37 rounds to 40; 22 rounds to 20
- 40 − 20 = 20
The exact answer is 15, close to the estimate.
7.Estimate 62 − 36 by rounding each number to the nearest 10.
Answer: 20
- 62 rounds to 60; 36 rounds to 40
- 60 − 40 = 20
The exact answer is 26, close to the estimate.
8.Estimate 74 + 82 by rounding each number to the nearest 10.
Answer: 150
- 74 rounds to 70; 82 rounds to 80
- 70 + 80 = 150
The exact answer is 156, close to the estimate.
9.Estimate 93 − 17 by rounding each number to the nearest 10.
Answer: 70
- 93 rounds to 90; 17 rounds to 20
- 90 − 20 = 70
The exact answer is 76, close to the estimate.
10.Estimate 84 + 22 by rounding each number to the nearest 10.
Answer: 100
- 84 rounds to 80; 22 rounds to 20
- 80 + 20 = 100
The exact answer is 106, 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.