Solve Vertical Addition: 31 + 6 Step by Step

$\begin{aligned} &31 \\ +& \\ &~~6 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

To solve this problem, we will follow these steps:

• Step 1: Align the numbers vertically with the units digits under each other: $31$ and $6$.
• Step 2: Add the units digits: $1 + 6 = 7$. There is no carryover in this simple addition.
• Step 3: The tens digit from the number 31, which is $3$, remains unchanged as there is no carry that affects this place value.
• Step 4: Write down the result of the addition, which is $37$.

Therefore, the sum of $31$ and $6$ is $37$.

The correct answer is choice 1: $37$.