Column 2 Addition

Problem:

 900
+338
-----
1238

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 + 8 = 8. Write down 8.
2. Tens place: 0 + 3 = 3. Write down 3.
3. Hundreds place: 9 + 3 = 12. Write down 12.

Result: 1238