Problem Description:
The task is to round 2-digit numbers to the nearest ten. The worksheet provides a list of numbers, and we need to fill in the rounded values.
Key Concept:
-
Rounding to the nearest ten:
- 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.
Solution:
#### Left Column:
1.
24: The ones digit is 4 (less than 5), so round down to 20.
- Rounded value:
20
2.
43: The ones digit is 3 (less than 5), so round down to 40.
- Rounded value:
40
3.
62: The ones digit is 2 (less than 5), so round down to 60.
- Rounded value:
60
4.
59: The ones digit is 9 (greater than or equal to 5), so round up to 60.
- Rounded value:
60
5.
69: The ones digit is 9 (greater than or equal to 5), so round up to 70.
- Rounded value:
70
6.
26: The ones digit is 6 (greater than or equal to 5), so round up to 30.
- Rounded value:
30
7.
42: The ones digit is 2 (less than 5), so round down to 40.
- Rounded value:
40
8.
83: The ones digit is 3 (less than 5), so round down to 80.
- Rounded value:
80
9.
74: The ones digit is 4 (less than 5), so round down to 70.
- Rounded value:
70
#### Right Column:
1.
4: Since it is a single-digit number, rounding to the nearest ten gives 0.
- Rounded value:
0
2.
78: The ones digit is 8 (greater than or equal to 5), so round up to 80.
- Rounded value:
80
3.
87: The ones digit is 7 (greater than or equal to 5), so round up to 90.
- Rounded value:
90
4.
18: The ones digit is 8 (greater than or equal to 5), so round up to 20.
- Rounded value:
20
5.
32: The ones digit is 2 (less than 5), so round down to 30.
- Rounded value:
30
6.
9: Since it is a single-digit number, rounding to the nearest ten gives 10.
- Rounded value:
10
7.
19: The ones digit is 9 (greater than or equal to 5), so round up to 20.
- Rounded value:
20
8.
28: The ones digit is 8 (greater than or equal to 5), so round up to 30.
- Rounded value:
30
9.
91: The ones digit is 1 (less than 5), so round down to 90.
- Rounded value:
90
Final Answer:
\[
\begin{array}{|c|c|}
\hline
24 & 20 \\
43 & 40 \\
62 & 60 \\
59 & 60 \\
69 & 70 \\
26 & 30 \\
42 & 40 \\
83 & 80 \\
74 & 70 \\
\hline
\end{array}
\quad
\begin{array}{|c|c|}
\hline
4 & 0 \\
78 & 80 \\
87 & 90 \\
18 & 20 \\
32 & 30 \\
9 & 10 \\
19 & 20 \\
28 & 30 \\
91 & 90 \\
\hline
\end{array}
\]
\boxed{
\begin{array}{|c|c|}
\hline
24 & 20 \\
43 & 40 \\
62 & 60 \\
59 & 60 \\
69 & 70 \\
26 & 30 \\
42 & 40 \\
83 & 80 \\
74 & 70 \\
\hline
\end{array}
\quad
\begin{array}{|c|c|}
\hline
4 & 0 \\
78 & 80 \\
87 & 90 \\
18 & 20 \\
32 & 30 \\
9 & 10 \\
19 & 20 \\
28 & 30 \\
91 & 90 \\
\hline
\end{array}
}
Parent Tip: Review the logic above to help your child master the concept of rounding worksheet grade 2.
