Problem Description:
The task involves solving a series of subtraction problems where the numbers are within 20. Each problem is presented in a grid format, and we need to subtract the bottom number from the top number for each pair.
Solution Approach:
1.
Identify the pairs: Each column contains two numbers, with the top number being subtracted by the bottom number.
2.
Perform the subtraction: Subtract the bottom number from the top number for each pair.
3.
Record the results: Write down the result of each subtraction.
Step-by-Step Solution:
#### First Row:
1. \( 18 - 5 = 13 \)
2. \( 13 - 12 = 1 \)
3. \( 18 - 13 = 5 \)
4. \( 17 - 1 = 16 \)
#### Second Row:
1. \( 17 - 6 = 11 \)
2. \( 19 - 9 = 10 \)
3. \( 9 - 5 = 4 \)
4. \( 15 - 2 = 13 \)
#### Third Row:
1. \( 15 - 3 = 12 \)
2. \( 13 - 2 = 11 \)
3. \( 12 - 11 = 1 \)
4. \( 19 - 8 = 11 \)
#### Fourth Row:
1. \( 16 - 12 = 4 \)
2. \( 11 - 1 = 10 \)
3. \( 14 - 2 = 12 \)
4. \( 18 - 4 = 14 \)
Final Results:
Organizing the results in the same grid format:
| 13 | 1 | 5 | 16 |
|----|----|----|----|
| 11 | 10 | 4 | 13 |
| 12 | 11 | 1 | 11 |
| 4 | 10 | 12 | 14 |
Final Answer:
\[
\boxed{
\begin{array}{cccc}
13 & 1 & 5 & 16 \\
11 & 10 & 4 & 13 \\
12 & 11 & 1 & 11 \\
4 & 10 & 12 & 14 \\
\end{array}
}
\]
Parent Tip: Review the logic above to help your child master the concept of subtraction worksheet numbers 1 20.
