Solution - Long subtraction
31
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones |
| 4 | 0 | |
| - | 9 | |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the ones column is too small to get a positive difference, borrow 1 from the digit (4) in the next number place which becomes (3) and get (10).
| Place value | tens | ones |
| 3 | 10 | |
| 4 | 0 | |
| - | 9 | |
Subtract the numbers in the ones column from the top number:
10-9=1
| Place value | tens | ones |
| 3 | 10 | |
| 4 | 0 | |
| - | 9 | |
| 1 |
Write 3 in the tens place.
| Place value | tens | ones |
| 3 | 10 | |
| 4 | 0 | |
| - | 9 | |
| 3 | 1 |
The solution is: 31
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