Solve Vertical Addition: 871 + 36 Step-by-Step

$\begin{aligned} &871 \\ +& \\ &~~36 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

To solve this problem, let's perform vertical addition:

• Step 1: Align the Numbers
  $871$
  + $36$
  $\underline{\phantom{7777}}$

• Step 2: Add the Units
  Add the digits in the unit’s place: $1 + 6 = 7$. Write 7 in the unit’s position.

• Step 3: Add the Tens
  Add the digits in the tens place: $7 + 3 = 10$. Write 0 in the tens position and carry over 1 to the hundreds.

• Step 4: Add the Hundreds
  Add the digits in the hundreds place, including the carry over: $8 + 1 = 9$.

By combining these steps, the complete sum is $907$.

Therefore, the solution to this problem is $\boxed{907}$.