Solution - Long subtraction
31,680
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 3 | 1 | 9 | 2 | 3 | |
| - | 2 | 4 | 3 | ||
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
3-3=0
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 3 | 1 | 9 | 2 | 3 | |
| - | 2 | 4 | 3 | ||
| 0 |
Because the upper digit (2) in the tens column is too small to get a positive difference, borrow 1 from the digit (9) in the next number place which becomes (8) and get (12).
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 8 | 12 | ||||
| 3 | 1 | 9 | 2 | 3 | |
| - | 2 | 4 | 3 | ||
| 0 |
Subtract the numbers in the tens column from the top number:
12-4=8
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 8 | 12 | ||||
| 3 | 1 | 9 | 2 | 3 | |
| - | 2 | 4 | 3 | ||
| 8 | 0 |
Subtract the numbers in the hundreds column from the top number:
8-2=6
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 8 | 12 | ||||
| 3 | 1 | 9 | 2 | 3 | |
| - | 2 | 4 | 3 | ||
| 6 | 8 | 0 |
Write 1 in the thousands place.
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 8 | 12 | ||||
| 3 | 1 | 9 | 2 | 3 | |
| - | 2 | 4 | 3 | ||
| 1 | 6 | 8 | 0 |
Write 3 in the ten thousands place.
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 8 | 12 | ||||
| 3 | 1 | 9 | 2 | 3 | |
| - | 2 | 4 | 3 | ||
| 3 | 1 | 6 | 8 | 0 |
The solution is: 31,680
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