5th Grade Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 2 — 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 2 — Practice Set 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 329 − 115 by rounding each number to the nearest 100.
Answer: 200
- 329 rounds to 300; 115 rounds to 100
- 300 − 100 = 200
The exact answer is 214, close to the estimate.
2.Estimate 57 × 4 by rounding 57 to the nearest 10.
Answer: 240
- 57 rounds to 60
- 60 × 4 = 240
The exact answer is 228.
3.Estimate 529 + 206 by rounding each number to the nearest 100.
Answer: 700
- 529 rounds to 500; 206 rounds to 200
- 500 + 200 = 700
The exact answer is 735, close to the estimate.
4.Estimate 55 × 3 by rounding 55 to the nearest 10.
Answer: 180
- 55 rounds to 60
- 60 × 3 = 180
The exact answer is 165.
5.Estimate 799 − 189 by rounding each number to the nearest 100.
Answer: 600
- 799 rounds to 800; 189 rounds to 200
- 800 − 200 = 600
The exact answer is 610, close to the estimate.
6.Estimate 46 × 5 by rounding 46 to the nearest 10.
Answer: 250
- 46 rounds to 50
- 50 × 5 = 250
The exact answer is 230.
7.Estimate 905 − 658 by rounding each number to the nearest 100.
Answer: 200
- 905 rounds to 900; 658 rounds to 700
- 900 − 700 = 200
The exact answer is 247, close to the estimate.
8.Estimate 89 × 9 by rounding 89 to the nearest 10.
Answer: 810
- 89 rounds to 90
- 90 × 9 = 810
The exact answer is 801.
9.Estimate 408 + 261 by rounding each number to the nearest 100.
Answer: 700
- 408 rounds to 400; 261 rounds to 300
- 400 + 300 = 700
The exact answer is 669, close to the estimate.
10.Estimate 79 × 5 by rounding 79 to the nearest 10.
Answer: 400
- 79 rounds to 80
- 80 × 5 = 400
The exact answer is 395.
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.