Sure! Let’s solve the worksheet
“Rounding to the Nearest 100 Using Number Lines (C)” step by step.
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🔢 Key Concept: Rounding to the Nearest 100
When rounding a number to the nearest 100, look at the
tens digit:
- If the
tens digit is 5 or greater (5–9) → round
UP to the next hundred.
- If the
tens digit is 4 or less (0–4) → round
DOWN to the previous hundred.
You can also visualize this on a number line: find which multiple of 100 the number is closest to.
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Now let’s go through each problem:
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✔ 1) 140 rounded to the nearest 100 is ___
- Tens digit =
4 → less than 5 → round
down
- 140 is between 100 and 200 → closer to
100
✔ Answer: 100
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✔ 2) 530 rounded to the nearest 100 is ___
- Tens digit =
3 → less than 5 → round
down
- 530 is between 500 and 600 → closer to
500
✔ Answer: 500
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✔ 3) 250 rounded to the nearest 100 is ___
- Tens digit =
5 → 5 or greater → round
up
- 250 is exactly halfway between 200 and 300 → we round
up to
300
✔ Answer: 300
> 💡 Note: By convention, when a number is exactly halfway (like 250, 350, etc.), we round
up.
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✔ 4) 890 rounded to the nearest 100 is ___
- Tens digit =
9 → greater than 5 → round
up
- 890 is between 800 and 900 → closer to
900
✔ Answer: 900
---
✔ 5) 20 rounded to the nearest 100 is ___
- Tens digit =
2 → less than 5 → round
down
- 20 is between 0 and 100 → closer to
0
✔ Answer: 0
---
✔ 6) 342 rounded to the nearest 100 is ___
- Tens digit =
4 → less than 5 → round
down
- 342 is between 300 and 400 → closer to
300
✔ Answer: 300
---
✔ 7) 815 rounded to the nearest 100 is ___
- Tens digit =
1 → less than 5 → round
down
- 815 is between 800 and 900 → closer to
800
✔ Answer: 800
---
✔ 8) 184 rounded to the nearest 100 is ___
- Tens digit =
8 → greater than 5 → round
up
- 184 is between 100 and 200 → closer to
200
✔ Answer: 200
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## 📝 Final Answers:
1)
100
2)
500
3)
300
4)
900
5)
0
6)
300
7)
800
8)
200
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## 🧭 How to Use the Number Line (for visual learners):
Each number line on the worksheet likely shows multiples of 100 (e.g., 0, 100, 200, 300...). You would:
- Find your number on the line.
- See which 100 it’s closest to.
- If it’s halfway (like 250), pick the higher 100.
Example: For 140 — it’s closer to 100 than to 200 → so 100.
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Let me know if you’d like a printable version or explanation with diagrams! 😊
Parent Tip: Review the logic above to help your child master the concept of rounding using number line worksheet.
