1
362
265
_____
6 2 7
Working from right to left, 5+ 2 = 7 ; no regrouping there.
Then, 6+6=12. Now that we have a double digit, the 2 stays and the 1 gets regrouped or carried over the the far left column.
Lastly, 3+2= 5 plus the 1 that has been regrouped = 6
Final answer- 627