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To solve the subtraction problem by vertically aligning the numbers, we will work as follows:
Step 1: Write the numbers vertically aligning by place value.
Step 2: Start subtracting from the units column (rightmost).
Subtract the units digit: .
Step 3: Move to the tens column.
Subtract the tens digit: .
The subtraction gives us a result.
Therefore, the solution to the problem is .
18
\( \begin{aligned} &105 \\ -& \\ &~~~~3 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)
Always start from the rightmost column (ones place) and work your way left. This is the standard procedure for vertical subtraction!
When the top digit is smaller than the bottom digit, you need to borrow from the next column to the left. But in this problem and , so no borrowing needed!
Use addition to check subtraction! Add your answer to the number you subtracted: . If you get the original number, you're correct!
Vertical alignment helps you subtract corresponding place values correctly. Ones subtract from ones, tens from tens, and so on. This prevents place value errors!
The horizontal line shows where to write your answer. It separates the problem from the solution, just like in addition problems!
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