We have hundreds of course questions with personalized recommendations + Account 100% premium
Let's solve the subtraction problem using vertical subtraction:
Step 1: Align the numbers vertically:
Step 2: Start with the rightmost column (units place):
Write under the line in the units place.
Step 3: Move to the left column (tens place):
Write under the line in the tens place. This gives us as the result.
Therefore, the solution to the problem is .
12
\( \begin{aligned} &105 \\ -& \\ &~~~~3 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)
When the bottom digit is larger, you need to borrow from the next column to the left. This is called regrouping, but it's not needed in this problem since 7 > 5 and 3 > 2.
Always start with the rightmost column (ones place) and work your way left. This is important because you might need to borrow from left columns later.
Use addition to check subtraction! Add your answer to the number you subtracted: . If you get the original number, you're right!
Yes! Proper alignment is crucial. The ones digits must be under ones digits, and tens digits under tens digits. Misalignment leads to wrong answers.
The horizontal line separates the problem from the answer. Write your final answer below this line, making sure each digit is in the correct column.
Get unlimited access to all 18 Arithmetic Operations questions, detailed video solutions, and personalized progress tracking.
Unlimited Video Solutions
Step-by-step explanations for every problem
Progress Analytics
Track your mastery across all topics
Ad-Free Learning
Focus on math without distractions
No credit card required • Cancel anytime