Exercises: Subtraction

$25-8$

Subtract from right to left. Subtract the ones first. Since $8$ is greater than $5$, you need to calculate $15-8=7$ and "memorize" a $1$ in the tens.

$\begin{array}{l}25\\ \underline{-{}_{1}8}\\ 7\end{array}$

Now subtract the tens: $2-1=1$.

$\begin{array}{l}25\\ \underline{-{}_{1}8}\\ 17\end{array}$

The result is therefore $17$.

$85-62$

Subtract from right to left. First, subtract the ones: $5-2=3$.

$\begin{array}{l}85\\ \underline{-62}\\ 3\end{array}$

Now subtract the tens: $8-6=2$.

$\begin{array}{l}85\\ \underline{-62}\\ 23\end{array}$

The result is therefore $23$.

$64-38$

Subtract from right to left. First, subtract the ones. Since $8$ is greater than $4$, you need to calculate $14-8=6$ and "memorize" a $1$ in the tens.

$\begin{array}{l}64\\ \underline{-3_{1}8}\\ 6\end{array}$

Now subtract the tens: $6-3-1=2$.

$\begin{array}{l}64\\ \underline{-3_{1}8}\\ 26\end{array}$

The result is therefore $26$.

$333-189$

Subtract from right to left. First, subtract the ones. Since $9$ is greater than $3$, you need to calculate $13-9=4$ and "memorize" a $1$ in the tens.

$\begin{array}{l}333\\ \underline{-18_{1}9}\\ 4\end{array}$

Then, subtract the tens. Since $9$ is greater than $3$, you need to calculate $13-9=4$ and "memorize" a $1$ in the hundreds.

$\begin{array}{l}333\\ \underline{-1_1{8}_{1}9}\\ 44\end{array}$

Now subtract the hundreds: $3-1-1=1$.

$\begin{array}{l}333\\ \underline{-1_1{8}_{1}9}\\ 144\end{array}$

The result is therefore $144$.

$587-292$

Subtract from right to left. First, subtract the ones: $7-2=5$.

$\begin{array}{l}587\\ \underline{-292}\\ 5\end{array}$

Then, subtract the tens. Since $9$ is greater than $8$, you need to calculate $18-9=9$ and "memorize" a $1$ in the hundreds.

$\begin{array}{l}587\\ \underline{-2_{1}92}\\ 95\end{array}$

Now subtract the hundreds: $5-2-1=2$.

$\begin{array}{l}587\\ \underline{-2_{1}92}\\ 295\end{array}$

The result is therefore $295$.