Solution - Long subtraction
30
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones |
| 4 | 0 | |
| - | 1 | 0 |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
0-0=0
| Place value | tens | ones |
| 4 | 0 | |
| - | 1 | 0 |
| 0 |
Subtract the numbers in the tens column from the top number:
4-1=3
| Place value | tens | ones |
| 4 | 0 | |
| - | 1 | 0 |
| 3 | 0 |
The solution is: 30
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