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To solve the problem of subtracting 78 from 988 using vertical subtraction, follow these steps:
Step 1: Write the numbers vertically, aligning by place values:
Step 2: Start the subtraction from the rightmost column (the ones place). Subtract 8 from 8 to get 0.
Step 3: Move to the tens column. The numbers are 8 - 7. This gives us 1.
Step 4: Move to the hundreds column. The numbers are 9 - 0. This gives us 9.
The result of the subtraction is:
Therefore, the solution to the problem is .
910
\( \begin{aligned} &105 \\ -& \\ &~~~~3 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)
Writing 078 helps you see that there's a zero in the hundreds place of 78. This makes it clear that you're subtracting 0 from 9 in the hundreds column, giving you 9.
When the top digit is smaller than the bottom digit, you borrow from the next column to the left. This problem doesn't require borrowing since 8≥8, 8≥7, and 9≥0.
Use addition to check subtraction! Add your answer to the number you subtracted: 910 + 78. If you get the original number (988), your answer is correct!
Yes, always start from the ones place! Just like addition, subtraction follows place value order. Starting from the left can lead to borrowing mistakes.
The horizontal line separates the problem from the answer, just like an equals sign. Write your final answer below this line after completing all column subtractions.
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