Year 4 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 3 — 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 — Practice Set 3 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 404 + 316 by rounding each number to the nearest 100.
Answer: 700
- 404 rounds to 400; 316 rounds to 300
- 400 + 300 = 700
The exact answer is 720, close to the estimate.
2.Estimate 43 × 4 by rounding 43 to the nearest 10.
Answer: 160
- 43 rounds to 40
- 40 × 4 = 160
The exact answer is 172.
3.Estimate 938 + 843 by rounding each number to the nearest 100.
Answer: 1,700
- 938 rounds to 900; 843 rounds to 800
- 900 + 800 = 1,700
The exact answer is 1,781, close to the estimate.
4.Estimate 54 × 3 by rounding 54 to the nearest 10.
Answer: 150
- 54 rounds to 50
- 50 × 3 = 150
The exact answer is 162.
5.Estimate 423 − 276 by rounding each number to the nearest 100.
Answer: 100
- 423 rounds to 400; 276 rounds to 300
- 400 − 300 = 100
The exact answer is 147, close to the estimate.
6.Estimate 26 × 8 by rounding 26 to the nearest 10.
Answer: 240
- 26 rounds to 30
- 30 × 8 = 240
The exact answer is 208.
7.Estimate 490 − 233 by rounding each number to the nearest 100.
Answer: 300
- 490 rounds to 500; 233 rounds to 200
- 500 − 200 = 300
The exact answer is 257, close to the estimate.
8.Estimate 59 × 6 by rounding 59 to the nearest 10.
Answer: 360
- 59 rounds to 60
- 60 × 6 = 360
The exact answer is 354.
9.Estimate 982 − 354 by rounding each number to the nearest 100.
Answer: 600
- 982 rounds to 1,000; 354 rounds to 400
- 1,000 − 400 = 600
The exact answer is 628, close to the estimate.
10.Estimate 56 × 8 by rounding 56 to the nearest 10.
Answer: 480
- 56 rounds to 60
- 60 × 8 = 480
The exact answer is 448.
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.