Solution - Long subtraction
479
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| 5 | 0 | 2 | |
| - | 2 | 3 | |
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 number to the left (50) which becomes (49) and get (12).
| Place value | hundreds | tens | ones |
| 4 | 9 | 12 | |
| 5 | 0 | 2 | |
| - | 2 | 3 | |
Subtract the numbers in the ones column from the top number:
12-3=9
| Place value | hundreds | tens | ones |
| 4 | 9 | 12 | |
| 5 | 0 | 2 | |
| - | 2 | 3 | |
| 9 |
Subtract the numbers in the tens column from the top number:
9-2=7
| Place value | hundreds | tens | ones |
| 4 | 9 | 12 | |
| 5 | 0 | 2 | |
| - | 2 | 3 | |
| 7 | 9 |
Write 4 in the hundreds place.
| Place value | hundreds | tens | ones |
| 4 | 9 | 12 | |
| 5 | 0 | 2 | |
| - | 2 | 3 | |
| 4 | 7 | 9 |
The solution is: 479
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