Column 3 Addition

Problem:

 640
+324
-----
964

Solution:

To solve this addition problem, we add the numbers column by column, starting from the rightmost column (the ones place).

1. Ones place: 0 + 4 = 4. Write down 4.
2. Tens place: 4 + 2 = 6. Write down 6.
3. Hundreds place: 6 + 3 = 9. Write down 9.

Result: 964