Rounding numbers to the nearest hundred with a helpful rhyme.
A math worksheet for rounding numbers to the nearest hundred, featuring a "rounding rhyme" mnemonic and a list of numbers to round.
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Show Answer Key & Explanations
Step-by-step solution for: Rounding to the nearest hundred online activity
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Show Answer Key & Explanations
Step-by-step solution for: Rounding to the nearest hundred online activity
Let's solve this rounding worksheet step by step using the rounding rhyme provided:
> **"Underline the digit,
> Look next door,
> If it’s 5 or higher,
> Add 1 more.
> If it’s 4 or lower,
> Just ignore."**
We are rounding each number to the nearest hundred.
---
1. Identify the hundreds digit (the third digit from the right).
2. Look at the tens digit (the one "next door").
3. If the tens digit is 5 or higher, round up (add 1 to the hundreds digit).
4. If the tens digit is 4 or lower, round down (keep the hundreds digit the same).
5. Replace the tens and ones digits with zeros.
---
Now let’s go through each number:
---
1. 570
- Hundreds digit: 5
- Tens digit: 7 → 7 ≥ 5 → round up
- 5 + 1 = 6 → 600
2. 446
- Hundreds digit: 4
- Tens digit: 4 → 4 < 5 → round down
- Keep 4 → 400
3. 233
- Hundreds digit: 2
- Tens digit: 3 → 3 < 5 → round down
- 200
4. 199
- Hundreds digit: 1
- Tens digit: 9 → 9 ≥ 5 → round up
- 1 + 1 = 2 → 200
5. 818
- Hundreds digit: 8
- Tens digit: 1 → 1 < 5 → round down
- 800
6. 899
- Hundreds digit: 8
- Tens digit: 9 → 9 ≥ 5 → round up
- 8 + 1 = 9 → 900
7. 327
- Hundreds digit: 3
- Tens digit: 2 → 2 < 5 → round down
- 300
8. 249
- Hundreds digit: 2
- Tens digit: 4 → 4 < 5 → round down
- 200
---
9. 126
- Hundreds digit: 1
- Tens digit: 2 → 2 < 5 → round down
- 100
10. 290
- Hundreds digit: 2
- Tens digit: 9 → 9 ≥ 5 → round up
- 2 + 1 = 3 → 300
11. 377
- Hundreds digit: 3
- Tens digit: 7 → 7 ≥ 5 → round up
- 3 + 1 = 4 → 400
12. 677
- Hundreds digit: 6
- Tens digit: 7 → 7 ≥ 5 → round up
- 6 + 1 = 7 → 700
13. 409
- Hundreds digit: 4
- Tens digit: 0 → 0 < 5 → round down
- 400
14. 564
- Hundreds digit: 5
- Tens digit: 6 → 6 ≥ 5 → round up
- 5 + 1 = 6 → 600
15. 352
- Hundreds digit: 3
- Tens digit: 5 → 5 ≥ 5 → round up
- 3 + 1 = 4 → 400
16. 856
- Hundreds digit: 8
- Tens digit: 5 → 5 ≥ 5 → round up
- 8 + 1 = 9 → 900
---
| Number | Rounded to Nearest Hundred |
|--------|-----------------------------|
| 570 | 600 |
| 446 | 400 |
| 233 | 200 |
| 199 | 200 |
| 818 | 800 |
| 899 | 900 |
| 327 | 300 |
| 249 | 200 |
| 126 | 100 |
| 290 | 300 |
| 377 | 400 |
| 677 | 700 |
| 409 | 400 |
| 564 | 600 |
| 352 | 400 |
| 856 | 900 |
---
Use the rhyme to remember:
- Underline the hundreds digit.
- Look at the tens digit.
- If it’s 5 or more, add 1 to the hundreds.
- If it’s 4 or less, keep it the same.
- Replace the last two digits with zeros.
✔ All numbers rounded correctly to the nearest hundred!
> **"Underline the digit,
> Look next door,
> If it’s 5 or higher,
> Add 1 more.
> If it’s 4 or lower,
> Just ignore."**
We are rounding each number to the nearest hundred.
---
🔁 How to Round to the Nearest Hundred:
1. Identify the hundreds digit (the third digit from the right).
2. Look at the tens digit (the one "next door").
3. If the tens digit is 5 or higher, round up (add 1 to the hundreds digit).
4. If the tens digit is 4 or lower, round down (keep the hundreds digit the same).
5. Replace the tens and ones digits with zeros.
---
Now let’s go through each number:
---
Left Column:
1. 570
- Hundreds digit: 5
- Tens digit: 7 → 7 ≥ 5 → round up
- 5 + 1 = 6 → 600
2. 446
- Hundreds digit: 4
- Tens digit: 4 → 4 < 5 → round down
- Keep 4 → 400
3. 233
- Hundreds digit: 2
- Tens digit: 3 → 3 < 5 → round down
- 200
4. 199
- Hundreds digit: 1
- Tens digit: 9 → 9 ≥ 5 → round up
- 1 + 1 = 2 → 200
5. 818
- Hundreds digit: 8
- Tens digit: 1 → 1 < 5 → round down
- 800
6. 899
- Hundreds digit: 8
- Tens digit: 9 → 9 ≥ 5 → round up
- 8 + 1 = 9 → 900
7. 327
- Hundreds digit: 3
- Tens digit: 2 → 2 < 5 → round down
- 300
8. 249
- Hundreds digit: 2
- Tens digit: 4 → 4 < 5 → round down
- 200
---
Right Column:
9. 126
- Hundreds digit: 1
- Tens digit: 2 → 2 < 5 → round down
- 100
10. 290
- Hundreds digit: 2
- Tens digit: 9 → 9 ≥ 5 → round up
- 2 + 1 = 3 → 300
11. 377
- Hundreds digit: 3
- Tens digit: 7 → 7 ≥ 5 → round up
- 3 + 1 = 4 → 400
12. 677
- Hundreds digit: 6
- Tens digit: 7 → 7 ≥ 5 → round up
- 6 + 1 = 7 → 700
13. 409
- Hundreds digit: 4
- Tens digit: 0 → 0 < 5 → round down
- 400
14. 564
- Hundreds digit: 5
- Tens digit: 6 → 6 ≥ 5 → round up
- 5 + 1 = 6 → 600
15. 352
- Hundreds digit: 3
- Tens digit: 5 → 5 ≥ 5 → round up
- 3 + 1 = 4 → 400
16. 856
- Hundreds digit: 8
- Tens digit: 5 → 5 ≥ 5 → round up
- 8 + 1 = 9 → 900
---
✔ Final Answers:
| Number | Rounded to Nearest Hundred |
|--------|-----------------------------|
| 570 | 600 |
| 446 | 400 |
| 233 | 200 |
| 199 | 200 |
| 818 | 800 |
| 899 | 900 |
| 327 | 300 |
| 249 | 200 |
| 126 | 100 |
| 290 | 300 |
| 377 | 400 |
| 677 | 700 |
| 409 | 400 |
| 564 | 600 |
| 352 | 400 |
| 856 | 900 |
---
📝 Summary:
Use the rhyme to remember:
- Underline the hundreds digit.
- Look at the tens digit.
- If it’s 5 or more, add 1 to the hundreds.
- If it’s 4 or less, keep it the same.
- Replace the last two digits with zeros.
✔ All numbers rounded correctly to the nearest hundred!
Parent Tip: Review the logic above to help your child master the concept of rounding to 100 worksheet.
