Problem Description:
The task is to decompose each given number into its
tens and
units components. This involves breaking down a two-digit number into the sum of a multiple of 10 (the tens place) and a single-digit number (the units place).
Solution Approach:
1.
Understand Decomposition:
- For any two-digit number \( N \), it can be expressed as:
\[
N = 10 \times \text{(tens digit)} + \text{(units digit)}
\]
- The
tens digit is the leftmost digit, and the
units digit is the rightmost digit.
2.
Apply Decomposition to Each Number:
- For each number in the image, identify the tens digit and the units digit.
- Write the tens digit in the left circle and the units digit in the right circle.
3.
Solve Step-by-Step:
-
First Row:
-
12: Tens = 10, Units = 2
-
19: Tens = 10, Units = 9
-
15: Tens = 10, Units = 5
-
Second Row:
-
14: Tens = 10, Units = 4
-
11: Tens = 10, Units = 1
-
10: Tens = 10, Units = 0
-
Third Row:
-
16: Tens = 10, Units = 6
-
17: Tens = 10, Units = 7
-
12: Tens = 10, Units = 2
-
Fourth Row:
-
13: Tens = 10, Units = 3
-
18: Tens = 10, Units = 8
-
20: Tens = 20, Units = 0 (Note: 20 is a special case where there are no units, only tens.)
4.
Final Answer:
- Fill in the circles accordingly:
-
First Row: \(12 \rightarrow 10, 2\); \(19 \rightarrow 10, 9\); \(15 \rightarrow 10, 5\)
-
Second Row: \(14 \rightarrow 10, 4\); \(11 \rightarrow 10, 1\); \(10 \rightarrow 10, 0\)
-
Third Row: \(16 \rightarrow 10, 6\); \(17 \rightarrow 10, 7\); \(12 \rightarrow 10, 2\)
-
Fourth Row: \(13 \rightarrow 10, 3\); \(18 \rightarrow 10, 8\); \(20 \rightarrow 20, 0\)
Final Answer:
\[
\boxed{
\begin{array}{ccc}
12 & 19 & 15 \\
10, 2 & 10, 9 & 10, 5 \\
14 & 11 & 10 \\
10, 4 & 10, 1 & 10, 0 \\
16 & 17 & 12 \\
10, 6 & 10, 7 & 10, 2 \\
13 & 18 & 20 \\
10, 3 & 10, 8 & 20, 0 \\
\end{array}
}
\]
Parent Tip: Review the logic above to help your child master the concept of class 1 maths worksheet.
