Solution - Long subtraction
144
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| 3 | 3 | 4 | |
| - | 1 | 9 | 0 |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
4-0=4
| Place value | hundreds | tens | ones |
| 3 | 3 | 4 | |
| - | 1 | 9 | 0 |
| 4 |
Because the upper digit (3) in the tens column is too small to get a positive difference, borrow 1 from the digit (3) in the next number place which becomes (2) and get (13).
| Place value | hundreds | tens | ones |
| 2 | 13 | ||
| 3 | 3 | 4 | |
| - | 1 | 9 | 0 |
| 4 |
Subtract the numbers in the tens column from the top number:
13-9=4
| Place value | hundreds | tens | ones |
| 2 | 13 | ||
| 3 | 3 | 4 | |
| - | 1 | 9 | 0 |
| 4 | 4 |
Subtract the numbers in the hundreds column from the top number:
2-1=1
| Place value | hundreds | tens | ones |
| 2 | 13 | ||
| 3 | 3 | 4 | |
| - | 1 | 9 | 0 |
| 1 | 4 | 4 |
The solution is: 144
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