Year 4 Estimating Sums, Differences and Products Worksheet — Level 2 — 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 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 869 − 623 by rounding each number to the nearest 100.
Answer: 300
- 869 rounds to 900; 623 rounds to 600
- 900 − 600 = 300
The exact answer is 246, close to the estimate.
2.Estimate 21 × 6 by rounding 21 to the nearest 10.
Answer: 120
- 21 rounds to 20
- 20 × 6 = 120
The exact answer is 126.
3.Estimate 147 + 907 by rounding each number to the nearest 100.
Answer: 1,000
- 147 rounds to 100; 907 rounds to 900
- 100 + 900 = 1,000
The exact answer is 1,054, close to the estimate.
4.Estimate 33 × 4 by rounding 33 to the nearest 10.
Answer: 120
- 33 rounds to 30
- 30 × 4 = 120
The exact answer is 132.
5.Estimate 812 + 134 by rounding each number to the nearest 100.
Answer: 900
- 812 rounds to 800; 134 rounds to 100
- 800 + 100 = 900
The exact answer is 946, close to the estimate.
6.Estimate 78 × 5 by rounding 78 to the nearest 10.
Answer: 400
- 78 rounds to 80
- 80 × 5 = 400
The exact answer is 390.
7.Estimate 626 + 515 by rounding each number to the nearest 100.
Answer: 1,100
- 626 rounds to 600; 515 rounds to 500
- 600 + 500 = 1,100
The exact answer is 1,141, close to the estimate.
8.Estimate 95 × 7 by rounding 95 to the nearest 10.
Answer: 700
- 95 rounds to 100
- 100 × 7 = 700
The exact answer is 665.
9.Estimate 585 + 601 by rounding each number to the nearest 100.
Answer: 1,200
- 585 rounds to 600; 601 rounds to 600
- 600 + 600 = 1,200
The exact answer is 1,186, close to the estimate.
10.Estimate 37 × 5 by rounding 37 to the nearest 10.
Answer: 200
- 37 rounds to 40
- 40 × 5 = 200
The exact answer is 185.
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.