5th Grade Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 4 — Answers
Answer sheet with worked solutions for the 5th Grade place value worksheet.
Success TutoringWorksheetsAnswer sheet5th Grade · Mathematics · Place Value5th 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 74 + 29 by rounding each number to the nearest 10.
Answer: 100
- 74 rounds to 70; 29 rounds to 30
- 70 + 30 = 100
The exact answer is 103, close to the estimate.
2.Estimate 42 + 46 by rounding each number to the nearest 10.
Answer: 90
- 42 rounds to 40; 46 rounds to 50
- 40 + 50 = 90
The exact answer is 88, close to the estimate.
3.Estimate 41 + 82 by rounding each number to the nearest 10.
Answer: 120
- 41 rounds to 40; 82 rounds to 80
- 40 + 80 = 120
The exact answer is 123, close to the estimate.
4.Estimate 19 + 21 by rounding each number to the nearest 10.
Answer: 40
- 19 rounds to 20; 21 rounds to 20
- 20 + 20 = 40
The exact answer is 40, close to the estimate.
5.Estimate 14 + 86 by rounding each number to the nearest 10.
Answer: 100
- 14 rounds to 10; 86 rounds to 90
- 10 + 90 = 100
The exact answer is 100, close to the estimate.
6.Estimate 37 + 96 by rounding each number to the nearest 10.
Answer: 140
- 37 rounds to 40; 96 rounds to 100
- 40 + 100 = 140
The exact answer is 133, close to the estimate.
7.Estimate 26 + 98 by rounding each number to the nearest 10.
Answer: 130
- 26 rounds to 30; 98 rounds to 100
- 30 + 100 = 130
The exact answer is 124, close to the estimate.
8.Estimate 74 + 28 by rounding each number to the nearest 10.
Answer: 100
- 74 rounds to 70; 28 rounds to 30
- 70 + 30 = 100
The exact answer is 102, close to the estimate.
9.Estimate 91 − 38 by rounding each number to the nearest 10.
Answer: 50
- 91 rounds to 90; 38 rounds to 40
- 90 − 40 = 50
The exact answer is 53, close to the estimate.
10.Estimate 43 − 31 by rounding each number to the nearest 10.
Answer: 10
- 43 rounds to 40; 31 rounds to 30
- 40 − 30 = 10
The exact answer is 12, 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.