Subtract 83 minus 66: Vertical Format Solution

$\begin{aligned} &83 \\ -& \\ &66 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

To solve this subtraction problem step-by-step, we perform the following:

First, align the numbers for vertical subtraction:

$\begin{array}{r} 83 \\ -66 \\ \hline \end{array}$

Step 1: Subtract the ones place:

The ones digit of $83$ (3) is smaller than the ones digit of $66$ (6). Therefore, we need to borrow.

• Borrow $1$ from the tens place of $83$, which becomes $7$ leaving the original ones place of 13.
• Subtract the ones digits: $13 - 6 = 7$

Step 2: Subtract the tens place:

Now that we've borrowed, we are left with $7$ in the tens place of the top number:

• Subtract the tens digits: $7 - 6 = 1$

Combine the results of the subtraction:

The final answer, after subtracting the two numbers, is $17$.

Therefore, the solution to the problem is $17$, which corresponds to choice 4.