Three-Digit Addition: Solve 664 + 227 in Vertical Format

To solve this problem using vertical addition, we follow these steps:

• Step 1: Add the digits in the ones column:
  The ones digits are $4 + 7 = 11$. We write down the 1 and carry over the other 1 to the tens column.
• Step 2: Add the digits in the tens column, including the carry:
  The tens digits are $6 + 2 = 8$, plus the carry of $1$ makes $9$. We write down the 9.
• Step 3: Add the digits in the hundreds column:
  The hundreds digits are $6 + 2 = 8$. No carry from the previous column this time. We write down the 8.

Therefore, combining these, the final result of adding 664 and 227 is $891$.

The correct choice from the multiple-choice options is $891$.