Solution - Long subtraction
47
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones |
| 5 | 2 | |
| 1 | ||
| - | 4 | |
2. Subtract the numbers using long subtraction method
Because the upper digit (2) in the ones column is too small to get a positive difference, borrow 1 from the digit (5) in the next number place which becomes (4) and get (12).
| Place value | tens | ones |
| 4 | 12 | |
| 5 | 2 | |
| 1 | ||
| - | 4 | |
Subtract the numbers in the ones column from the top number:
12-1-4=7
| Place value | tens | ones |
| 4 | 12 | |
| 5 | 2 | |
| 1 | ||
| - | 4 | |
| 7 |
Write 4 in the tens place.
| Place value | tens | ones |
| 4 | 12 | |
| 5 | 2 | |
| 1 | ||
| - | 4 | |
| 4 | 7 |
The solution is: 47
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