Use addition:
9865 + 1245:
Line up our numbers vertically:
| 9 | 8 | 6 | 5 | |
| + | 1 | 2 | 4 | 5 |
| 9 | 8 | 6 | 5 | |
| + | 1 | 2 | 4 | 5 | 0 |
Column 1: 5 + 5 = 10
Since 10 > 9, we take the right digit = 0.
Carry the 1 for Column 2
| 1 | ||||
| 9 | 8 | 6 | 5 | |
| + | 1 | 2 | 4 | 5 | 1 | 0 |
Column 2: Carry the 1 from Column 1
1 + 6 + 4 = 11
Since 11 > 9, we take the right digit = 1.
Carry the 1 for Column 3
| 1 | 1 | |||
| 9 | 8 | 6 | 5 | |
| + | 1 | 2 | 4 | 5 | 1 | 1 | 0 |
Column 3: Carry the 1 from Column 2
1 + 8 + 2 = 11
Since 11 > 9, we take the right digit = 1.
Carry the 1 for Column 4
| 1 | 1 | 1 | ||
| 9 | 8 | 6 | 5 | |
| + | 1 | 2 | 4 | 5 | 1 | 1 | 1 | 0 |
Column 4: Carry the 1 from Column 3
1 + 9 + 1 = 11
Since 11 > 9, we take the right digit = 1.
Carry the 1 for Column 5
| 1 | 1 | 1 | 1 | |
| 9 | 8 | 6 | 5 | |
| + | 1 | 2 | 4 | 5 |
| 1 | 1 | 1 | 1 | 0 |
Final Answer
Answer = 9865 + 1245 = 11110
