Use addition:
15 + 12:
Line up our numbers vertically:
| 1 | 5 | |
| + | 1 | 2 |
| 1 | 5 | |
| + | 1 | 2 | 7 |
Column 1: 5 + 2 = 7
| 1 | 5 | |
| + | 1 | 2 | 2 | 7 |
Column 2: 1 + 1 = 2
Final Answer
Answer = 15 + 12 = 27
Use addition:
15 + 12:
Line up our numbers vertically:
| 1 | 5 | |
| + | 1 | 2 |
| 1 | 5 | |
| + | 1 | 2 | 7 |
Column 1: 5 + 2 = 7
| 1 | 5 | |
| + | 1 | 2 | 2 | 7 |
Column 2: 1 + 1 = 2
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