Students can practice rounding whole numbers to the nearest hundred to estimate the difference in these subtraction problems.

Let's solve the problem step by step.

Task:

Estimate the difference by rounding each whole number to the nearest hundred, then subtract.

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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

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2. 698 - 365

- Round 698 → 700
- Round 365 → 400
- Subtract: 700 - 400 = 300

✔ Answer: 700 - 400 = 300

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3. 784 - 598

- Round 784 → 800
- Round 598 → 600
- Subtract: 800 - 600 = 200

✔ Answer: 800 - 600 = 200

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4. 452 - 256

- Round 452 → 500
- Round 256 → 300
- Subtract: 500 - 300 = 200

✔ Answer: 500 - 300 = 200

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5. 875 - 754

- Round 875 → 900
- Round 754 → 800
- Subtract: 900 - 800 = 100

✔ Answer: 900 - 800 = 100

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6. 658 - 325

- Round 658 → 700
- Round 325 → 300
- Subtract: 700 - 300 = 400

✔ Answer: 700 - 300 = 400

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7. 452 - 273

- Round 452 → 500
- Round 273 → 300
- Subtract: 500 - 300 = 200

✔ Answer: 500 - 300 = 200

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8. 565 - 532

- Round 565 → 600
- Round 532 → 500
- Subtract: 600 - 500 = 100

✔ Answer: 600 - 500 = 100

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9. 698 - 333

- Round 698 → 700
- Round 333 → 300
- Subtract: 700 - 300 = 400

✔ Answer: 700 - 300 = 400

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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 | 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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🔍 Explanation of Rounding Rule:

To round to the nearest hundred:
- Look at the tens digit.
- If it's less than 50, round down.
- If it's 50 or more, round up.

For example:
- 678 → tens digit is 7 (70), so round up to 700
- 541 → tens digit is 4 (40), so round down to 500

This method gives a quick estimate of the difference, which is useful for mental math and checking answers.

Let me know if you'd like the actual exact differences too!