Printable Estimation Addition Rounding Hundred Worksheet - Class ... - Free Printable

Let's solve the problem step by step.

Task:

Estimate the sum by rounding each number to the nearest hundred, then add the rounded numbers.

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We'll go through each addition problem one by one, round both numbers to the nearest hundred, and then add them.

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#### 1. 653 + 239
- 653 → nearest hundred: 700 (since 653 is closer to 700 than 600)
- 239 → nearest hundred: 200 (239 is closer to 200 than 300)
- Estimate: 700 + 200 = 900 ✔ (Matches given answer)

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#### 2. 312 + 435
- 312 → 300 (closer to 300 than 400)
- 435 → 400 (closer to 400 than 500)
- Estimate: 300 + 400 = 700

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#### 3. 893 + 156
- 893 → 900 (closer to 900 than 800)
- 156 → 200 (closer to 200 than 100)
- Estimate: 900 + 200 = 1100

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#### 4. 581 + 719
- 581 → 600 (closer to 600 than 500)
- 719 → 700 (closer to 700 than 800)
- Estimate: 600 + 700 = 1300

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#### 5. 232 + 817
- 232 → 200
- 817 → 800
- Estimate: 200 + 800 = 1000

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#### 6. 211 + 364
- 211 → 200
- 364 → 400
- Estimate: 200 + 400 = 600

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#### 7. 764 + 309
- 764 → 800
- 309 → 300
- Estimate: 800 + 300 = 1100

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#### 8. 564 + 333
- 564 → 600
- 333 → 300
- Estimate: 600 + 300 = 900

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#### 9. 109 + 256
- 109 → 100
- 256 → 300
- Estimate: 100 + 300 = 400

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#### 10. 807 + 876
- 807 → 800
- 876 → 900
- Estimate: 800 + 900 = 1700

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#### 11. 659 + 145
- 659 → 700
- 145 → 100
- Estimate: 700 + 100 = 800

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#### 12. 148 + 398
- 148 → 100
- 398 → 400
- Estimate: 100 + 400 = 500

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#### 13. 499 + 209
- 499 → 500
- 209 → 200
- Estimate: 500 + 200 = 700

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#### 14. 352 + 189
- 352 → 400
- 189 → 200
- Estimate: 400 + 200 = 600

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#### 15. 765 + 476
- 765 → 800
- 476 → 500
- Estimate: 800 + 500 = 1300

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✔ Final Answers (fill in the blanks):

| Problem | Rounded Sum |
|----------------|-------------|
| 312 + 435 | 300 + 400 = 700 |
| 893 + 156 | 900 + 200 = 1100 |
| 581 + 719 | 600 + 700 = 1300 |
| 232 + 817 | 200 + 800 = 1000 |
| 211 + 364 | 200 + 400 = 600 |
| 764 + 309 | 800 + 300 = 1100 |
| 564 + 333 | 600 + 300 = 900 |
| 109 + 256 | 100 + 300 = 400 |
| 807 + 876 | 800 + 900 = 1700 |
| 659 + 145 | 700 + 100 = 800 |
| 148 + 398 | 100 + 400 = 500 |
| 499 + 209 | 500 + 200 = 700 |
| 352 + 189 | 400 + 200 = 600 |
| 765 + 476 | 800 + 500 = 1300 |

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📌 Summary:

To estimate sums by rounding to the nearest hundred:
1. Round each number to the nearest hundred.
2. Add the rounded numbers.
3. Write the estimated sum.

This method gives a quick approximation useful for checking reasonableness of exact calculations.

Let me know if you'd like this as a printable answer sheet!