Subtract 968 minus 89: Vertical Format Solution

$\begin{aligned} &968 \\ -& \\ &~~89 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

To solve the problem $968 - 89$ using vertical subtraction, follow these steps:

• Align the numbers vertically by place value:

$\begin{array}{c} ~ & 9 & 6 & 8 \\ - & ~ & 8 & 9 \\ \hline \end{array}$

• Subtract the rightmost column (units):
  Since $8 - 9$ is not possible directly, we borrow 1 from the tens column.

• After borrowing, the units column becomes $18 - 9 = 9$.

$\begin{array}{c} ~ & 9 & \cancel{\textcolor{red}{6}}~{5} \to & 18 \\ - & ~ & 8~~ & 9 \\ \hline ~ & ~ & ~ & 9 \\ \end{array}$

• Subtract the tens column:
  After borrowing, the tens column becomes $5 - 8$ not possible, so borrow 1 from the hundreds column.

• After borrowing, the tens column becomes $15 - 8 = 7$.

$\begin{array}{c} ~ & \cancel{\textcolor{red}{9}}~ 8\to &{15} & 8 \\ - & ~ & 8 & 9 \\ \hline ~ & ~ & 7 \\ \end{array}$

• Subtract the hundreds column:
  Now simply $8 - 0 = 8$ since there is nothing to subtract.

$\begin{array}{c} ~ & 8 & ~ & ~ \\ - & ~ & ~ & ~ \\ \hline &8 & 7 & 9 \\ \end{array}$

Therefore, the solution to the problem is $879$.