Solve Vertical Addition: 957 + 3 Step by Step

We will solve the problem using vertical addition as follows:

• Step 1: Align the numbers by their place values.
  $\begin{aligned} &957 \\ + &~~~~3 \\ \end{aligned}$
• Step 2: Add the digits starting from the rightmost side, which is the units column.

First, add the digits in the units place:
$7 + 3 = 10$.

Since 10 is composed of 0 in the units place and carry over 1 to the tens place, write 0 in the units place and remember to carry over the 1.

Next, move to the tens place and add up the digits, considering the carryover:
$5 + 0 + 1 = 6$.

Finally, add the hundreds place, which has no other digits to add:
$\begin{aligned} & 9 \\ &\underline{ }\ \\ & 9 \quad\ (hundreds)\\ \end{aligned}$

Summarizing, the addition yields the following:

$\begin{aligned} \qquad\qquad &957 \\ + &~~~~3 \\ &\underline{\phantom{776}} \\ \quad\ &960 \\ \end{aligned}$

Therefore, the result of adding 957 and 3 is $\mathbf{960}$.

The correct answer from the choices given is Choice 4: 960.

Thus, the correct solution to the problem is $960$.