Solve the Addition Problem: 215 + 3 in Vertical Format

To solve this problem, we'll perform vertical addition by following these steps:

• Step 1: Align the numbers 215 and 3 vertically, ensuring the rightmost digits (the ones place) line up:

$\begin{array}{r} 215 \\ + \phantom{1}3 \\ \underline{\phantom{776}} \\ \end{array}$

• Step 2: Add the digits in the ones place: $5 + 3 = 8$. Write 8 in the ones place of the sum.
• Step 3: Move to the tens place. Since there is no digit in the tens place for 3, we add $1 + 0 = 1$. Write 1 in the tens place of the sum.
• Step 4: For the hundreds place, there is only the digit 2 from 215, so write 2 in the hundreds place of the sum.

The resulting sum is:

$\begin{array}{r} \phantom{1}218 \\ \end{array}$

Therefore, the solution to the problem is $218$.