Solve Three-Digit Addition: 156 + 254 Using Vertical Format

To solve this problem, we'll follow these steps:

• Step 1: Add the digits in the units column.
• Step 2: Add the digits in the tens column, including any carry from the units column.
• Step 3: Add the digits in the hundreds column, including any carry from the tens column.

Now, let's work through each step:

Step 1: Adding Units
- Consider the rightmost column (units place). We add the digits: $6$ (from 156) and $4$ (from 254).
- $6 + 4 = 10$.
- We write down $0$ in the units place and carry over $1$ to the tens place.

Step 2: Adding Tens
- Move to the next column on the left (tens place). We add the digits: $5$ (from 156), $5$ (from 254), plus the carry-over $1$ from the previous step.
- $5 + 5 + 1 = 11$.
- We write down $1$ in the tens place and carry over $1$ to the hundreds place.

Step 3: Adding Hundreds
- Move to the hundreds column. We add the digits: $1$ (from 156), $2$ (from 254), plus the carry-over $1$.
- $1 + 2 + 1 = 4$.
- We write down $4$ in the hundreds place.

Putting it all together, the sum of $156 + 254 = 410$.

Therefore, the solution to the problem is $410$.