Solution - Long subtraction
4
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones |
| 5 | |
| - | 1 |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
5-1=4
| Place value | ones |
| 5 | |
| - | 1 |
| 4 |
The solution is: 4
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