Use addition:
29028 + 1312:
Line up our numbers vertically:
2 | 9 | 0 | 2 | 8 | |
+ | 1 | 3 | 1 | 2 |
2 | 9 | 0 | 2 | 8 | |
+ | 1 | 3 | 1 | 2 | 0 |
Column 1: 8 + 2 = 10
Since 10 > 9, we take the right digit = 0.
Carry the 1 for Column 2
1 | |||||
2 | 9 | 0 | 2 | 8 | |
+ | 1 | 3 | 1 | 2 | 4 | 0 |
Column 2: Carry the 1 from Column 1
1 + 2 + 1 = 4
1 | |||||
2 | 9 | 0 | 2 | 8 | |
+ | 1 | 3 | 1 | 2 | 3 | 4 | 0 |
Column 3: 0 + 3 = 3
1 | |||||
2 | 9 | 0 | 2 | 8 | |
+ | 1 | 3 | 1 | 2 | 0 | 3 | 4 | 0 |
Column 4: 9 + 1 = 10
Since 10 > 9, we take the right digit = 0.
Carry the 1 for Column 5
1 | 1 | ||||
2 | 9 | 0 | 2 | 8 | |
+ | 1 | 3 | 1 | 2 | 3 | 0 | 3 | 4 | 0 |
Column 5: Carry the 1 from Column 4
1 + 2 + 0 = 3