Use partial sum addition:
36523 + 98:
Line up our numbers vertically:
3 | 6 | 5 | 2 | 3 | |
+ | 9 | 8 |
3 | 6 | 5 | 2 | 3 | 9 | 8 |
3 | 0 | 0 | 0 | 0 | |
+ |
3 | 6 | 5 | 2 | 3 | 9 | 8 |
3 | 0 | 0 | 0 | 0 | |
6 | 0 | 0 | 0 | ||
+ |
3 | 6 | 5 | 2 | 3 | 9 | 8 |
3 | 0 | 0 | 0 | 0 | |
6 | 0 | 0 | 0 | ||
5 | 0 | 0 | |||
+ |
3 | 6 | 5 | 2 | 3 | 9 | 8 |
3 | 0 | 0 | 0 | 0 | |
6 | 0 | 0 | 0 | ||
5 | 0 | 0 | |||
1 | 1 | 0 | |||
+ |
3 | 6 | 5 | 2 | 3 | 9 | 8 |
3 | 0 | 0 | 0 | 0 | |
6 | 0 | 0 | 0 | ||
5 | 0 | 0 | |||
1 | 1 | 0 | |||
1 | 1 | ||||
+ |
3 | 6 | 5 | 2 | 3 | 9 | 8 |
3 | 0 | 0 | 0 | 0 | |
6 | 0 | 0 | 0 | ||
5 | 0 | 0 | |||
1 | 1 | 0 | |||
1 | 1 | ||||
3 | 6 | 6 | 2 | 1 | |
+ |