Solution - Long subtraction
2,921
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 3 | 2 | 2 | 5 | |
| - | 3 | 0 | 4 | |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
5-4=1
| Place value | thousands | hundreds | tens | ones |
| 3 | 2 | 2 | 5 | |
| - | 3 | 0 | 4 | |
| 1 |
Subtract the numbers in the tens column from the top number:
2-0=2
| Place value | thousands | hundreds | tens | ones |
| 3 | 2 | 2 | 5 | |
| - | 3 | 0 | 4 | |
| 2 | 1 |
Because the upper digit (2) in the hundreds 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 (12).
| Place value | thousands | hundreds | tens | ones |
| 2 | 12 | |||
| 3 | 2 | 2 | 5 | |
| - | 3 | 0 | 4 | |
| 2 | 1 |
Subtract the numbers in the hundreds column from the top number:
12-3=9
| Place value | thousands | hundreds | tens | ones |
| 2 | 12 | |||
| 3 | 2 | 2 | 5 | |
| - | 3 | 0 | 4 | |
| 9 | 2 | 1 |
Write 2 in the thousands place.
| Place value | thousands | hundreds | tens | ones |
| 2 | 12 | |||
| 3 | 2 | 2 | 5 | |
| - | 3 | 0 | 4 | |
| 2 | 9 | 2 | 1 |
The solution is: 2,921
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