Solution - Long subtraction
1,440
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 1 | 8 | 3 | 4 | |
| - | 3 | 9 | 4 | |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
4-4=0
| Place value | thousands | hundreds | tens | ones |
| 1 | 8 | 3 | 4 | |
| - | 3 | 9 | 4 | |
| 0 |
Because the upper digit (3) in the tens column is too small to get a positive difference, borrow 1 from the digit (8) in the next number place which becomes (7) and get (13).
| Place value | thousands | hundreds | tens | ones |
| 7 | 13 | |||
| 1 | 8 | 3 | 4 | |
| - | 3 | 9 | 4 | |
| 0 |
Subtract the numbers in the tens column from the top number:
13-9=4
| Place value | thousands | hundreds | tens | ones |
| 7 | 13 | |||
| 1 | 8 | 3 | 4 | |
| - | 3 | 9 | 4 | |
| 4 | 0 |
Subtract the numbers in the hundreds column from the top number:
7-3=4
| Place value | thousands | hundreds | tens | ones |
| 7 | 13 | |||
| 1 | 8 | 3 | 4 | |
| - | 3 | 9 | 4 | |
| 4 | 4 | 0 |
Write 1 in the thousands place.
| Place value | thousands | hundreds | tens | ones |
| 7 | 13 | |||
| 1 | 8 | 3 | 4 | |
| - | 3 | 9 | 4 | |
| 1 | 4 | 4 | 0 |
The solution is: 1,440
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