Addition of numbers arranged vertically

Example 1

2. Add ones: 6 + 9 = 15. Regroup 15 as 1 tens and 5 ones. Write 5 in the ones position and add 1 to the tens position.
3. Add tens: 1 + 8 + 9 = 18. Regroup 18 as 1 hundreds and 8 tens. Write 8 in the tens position and add 1 to the hundreds position.
4. Add hundreds: 1 + 1 + 8 = 10. Regroup 10 as 1 thousands and 0 hundreds. Write 0 in the hundreds position and add 1 to the thousands position.
5. Add thousands: 1 + 8 + 4 = 13. Regroup 13 as 1 ten thousands and 3 thousands. Write 3 in the thousands position and add 1 to the ten thousands position.
6. Add ten thousands: 1 + 2 + 7 = 10. Regroup 10 as 1 hundred thousands and 0 ten thousands. Write 0 in the ten thousands position and add 1 to the hundred thousands position.
7. Add hundred thousands: 1 + 2 + 3 = 6. Write 6 in the hundred thousands position.

Therefore, the answer is 603,085.