Subtraction can be done in vertical format. Find the difference. $\begin{array} { r }
- \quad 20 \
10 \
\hline
\end{array}$
A) -35
B) -23
C) -32
D) -30
E) -27

Question

Subtraction can be done in vertical format. Find the difference. $\begin{array} { r } 
- \quad 20 \
10 \
\hline
\end{array}$
A) -35
B) -23
C) -32
D) -30
E) -27

Quizplus · Accepted Answer

Start by subtracting the ones place. 0 minus 0 is 0. Write that below the ones place.

Then, move on to the tens place. 1 minus 2 is -1.

Since we can't have a negative digit in the tens place, we have to "borrow" from the hundreds place. The 2 in the hundreds place becomes 1 and the 0 in the tens place becomes 10.

Now, we can subtract 10 from 11 in the tens place, getting 1. Write that in the tens place below the line.

Finally, write the 1 from the hundreds place below the line.

The final answer is -30, which is choice D.

Subtraction Can Be Done in Vertical Format −2010\begin{array} { r } - \quad 20 \\10 \\\hline\end{array}−2010​​

Subtraction Can Be Done in Vertical Format $\begin{array} { r } - \quad 20 \\10 \\\hline\end{array}$