Let's solve each problem step by step using the number line method to
round to the nearest ten.
---
🔷 Rule for Rounding to the Nearest Ten:
- If the
ones digit is 5 or more, round
up.
- If the
ones digit is less than 5, round
down.
We’ll use the number lines provided to visualize this.
---
✔ Problem 1: 43
- Number line: 40 → 43 → 45 → 50
- 43 is between 40 and 50.
- The ones digit is
3 (less than 5), so we round
down.
-
✔ Answer: 40 (already given)
---
🟦 Problem 2: 76
- Number line: 70 → 75 → 80
- 76 is between 70 and 80.
- The ones digit is
6 (≥ 5), so we round
up.
-
✔ Answer: 80
---
🟦 Problem 3: 28
- Number line: 20 → 25 → 30
- 28 is between 20 and 30.
- The ones digit is
8 (≥ 5), so we round
up.
-
✔ Answer: 30
---
🟦 Problem 4: 59
- Number line: 50 → 55 → 60
- 59 is between 50 and 60.
- The ones digit is
9 (≥ 5), so we round
up.
-
✔ Answer: 60
---
🟦 Problem 5: 81
- Number line: 80 → 85 → 90
- 81 is between 80 and 90.
- The ones digit is
1 (< 5), so we round
down.
-
✔ Answer: 80
---
🟦 Problem 6: 34
- Number line: 30 → 35 → 40
- 34 is between 30 and 40.
- The ones digit is
4 (< 5), so we round
down.
-
✔ Answer: 30
---
🟦 Problem 7: 15
- Number line: 10 → 15 → 20
- 15 is exactly halfway between 10 and 20.
- Rule: When it's
exactly halfway, we
round up.
-
✔ Answer: 20
---
🟦 Problem 8: 65
- Number line: 60 → 65 → 70
- 65 is halfway between 60 and 70.
- Again,
round up when halfway.
-
✔ Answer: 70
---
✔ Final Answers:
| Number | Rounded to Nearest Ten |
|--------|------------------------|
| 43 | 40 |
| 76 |
80 |
| 28 |
30 |
| 59 |
60 |
| 81 |
80 |
| 34 |
30 |
| 15 |
20 |
| 65 |
70 |
---
📝 Explanation Summary:
- Use the
number line to see where the number falls.
- Look at the
ones digit to decide whether to round up or down.
- If it’s
5 or more, go to the
next ten.
- If it’s
less than 5, stay at the
current ten.
- For
exact halfway points (like 15, 25, 35...), always
round up.
✔ All answers are filled in based on this logic.
Let me know if you'd like a printable version or visual guide!
Parent Tip: Review the logic above to help your child master the concept of rounding numbers number line worksheet.
