Problem Description:
The task involves rounding numbers to the nearest ten using a number line as a visual aid. The first example is already completed: the number
43 is rounded to
40. You need to round the remaining numbers (
76, 28, 59, 81, 34, 17, 62) to the nearest ten and fill in the blanks.
Solution Approach:
To round a number to the nearest ten:
1. Identify the tens digit of the number.
2. Look at the ones digit:
- If the ones digit is
0–4, round down to the nearest ten.
- If the ones digit is
5–9, round up to the nearest ten.
3. Use the number line as a visual guide to confirm the rounding direction.
Step-by-Step Solution:
#### 1.
76
- Tens digit: 7
- Ones digit: 6 (which is 5 or greater)
- Round up to the nearest ten:
80
- Number line visualization: 76 is closer to 80 than to 70.
#### 2.
28
- Tens digit: 2
- Ones digit: 8 (which is 5 or greater)
- Round up to the nearest ten:
30
- Number line visualization: 28 is closer to 30 than to 20.
#### 3.
59
- Tens digit: 5
- Ones digit: 9 (which is 5 or greater)
- Round up to the nearest ten:
60
- Number line visualization: 59 is closer to 60 than to 50.
#### 4.
81
- Tens digit: 8
- Ones digit: 1 (which is less than 5)
- Round down to the nearest ten:
80
- Number line visualization: 81 is closer to 80 than to 90.
#### 5.
34
- Tens digit: 3
- Ones digit: 4 (which is less than 5)
- Round down to the nearest ten:
30
- Number line visualization: 34 is closer to 30 than to 40.
#### 6.
17
- Tens digit: 1
- Ones digit: 7 (which is 5 or greater)
- Round up to the nearest ten:
20
- Number line visualization: 17 is closer to 20 than to 10.
#### 7.
62
- Tens digit: 6
- Ones digit: 2 (which is less than 5)
- Round down to the nearest ten:
60
- Number line visualization: 62 is closer to 60 than to 70.
Final Answer:
Fill in the blanks with the rounded values:
-
76: 80
-
28: 30
-
59: 60
-
81: 80
-
34: 30
-
17: 20
-
62: 60
$$
\boxed{80, 30, 60, 80, 30, 20, 60}
$$
Parent Tip: Review the logic above to help your child master the concept of rounding worksheet for 2nd grade.
