Let's solve the problem step by step.
Task:
Estimate the difference by
rounding each whole number to the nearest hundred, then subtract.
---
We'll go through each problem:
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1. 678 - 541
- Round 678 → nearest hundred:
700
- Round 541 → nearest hundred:
500
- Now subtract: 700 - 500 =
200
✔ Answer:
700 - 500 = 200
---
2. 698 - 365
- Round 698 →
700
- Round 365 →
400
- Subtract: 700 - 400 =
300
✔ Answer:
700 - 400 = 300
---
3. 784 - 598
- Round 784 →
800
- Round 598 →
600
- Subtract: 800 - 600 =
200
✔ Answer:
800 - 600 = 200
---
4. 452 - 256
- Round 452 →
500
- Round 256 →
300
- Subtract: 500 - 300 =
200
✔ Answer:
500 - 300 = 200
---
5. 875 - 754
- Round 875 →
900
- Round 754 →
800
- Subtract: 900 - 800 =
100
✔ Answer:
900 - 800 = 100
---
6. 658 - 325
- Round 658 →
700
- Round 325 →
300
- Subtract: 700 - 300 =
400
✔ Answer:
700 - 300 = 400
---
7. 452 - 273
- Round 452 →
500
- Round 273 →
300
- Subtract: 500 - 300 =
200
✔ Answer:
500 - 300 = 200
---
8. 565 - 532
- Round 565 →
600
- Round 532 →
500
- Subtract: 600 - 500 =
100
✔ Answer:
600 - 500 = 100
---
9. 698 - 333
- Round 698 →
700
- Round 333 →
300
- Subtract: 700 - 300 =
400
✔ Answer:
700 - 300 = 400
---
10. 547 - 323
- Round 547 →
500
- Round 323 →
300
- Subtract: 500 - 300 =
200
✔ Answer:
500 - 300 = 200
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✔ Final Answers (filled in):
| Problem | Rounded Numbers | Estimated Difference |
|--------|------------------|-----------------------|
| 1. 678 - 541 | 700 - 500 = |
200 |
| 2. 698 - 365 | 700 - 400 = |
300 |
| 3. 784 - 598 | 800 - 600 = |
200 |
| 4. 452 - 256 | 500 - 300 = |
200 |
| 5. 875 - 754 | 900 - 800 = |
100 |
| 6. 658 - 325 | 700 - 300 = |
400 |
| 7. 452 - 273 | 500 - 300 = |
200 |
| 8. 565 - 532 | 600 - 500 = |
100 |
| 9. 698 - 333 | 700 - 300 = |
400 |
| 10. 547 - 323 | 500 - 300 = |
200 |
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📝 Summary:
This worksheet teaches
estimation by rounding numbers to the nearest hundred before subtracting. This gives a quick, approximate answer that is useful for mental math or checking calculations.
Let me know if you'd like the exact differences too!
Parent Tip: Review the logic above to help your child master the concept of 3rd grade estimation worksheet.
