Solution - Long subtraction
4,879
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 6 | 4 | 0 | 0 | |
| - | 1 | 5 | 2 | 1 |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the ones column is too small to get a positive difference, borrow 1 from the number to the left (40) which becomes (39) and get (10).
| Place value | thousands | hundreds | tens | ones |
| 3 | 9 | 10 | ||
| 6 | 4 | 0 | 0 | |
| - | 1 | 5 | 2 | 1 |
Subtract the numbers in the ones column from the top number:
10-1=9
| Place value | thousands | hundreds | tens | ones |
| 3 | 9 | 10 | ||
| 6 | 4 | 0 | 0 | |
| - | 1 | 5 | 2 | 1 |
| 9 |
Subtract the numbers in the tens column from the top number:
9-2=7
| Place value | thousands | hundreds | tens | ones |
| 3 | 9 | 10 | ||
| 6 | 4 | 0 | 0 | |
| - | 1 | 5 | 2 | 1 |
| 7 | 9 |
Because the upper digit (3) in the hundreds column is too small to get a positive difference, borrow 1 from the digit (6) in the next number place which becomes (5) and get (13).
| Place value | thousands | hundreds | tens | ones |
| 5 | 13 | |||
| 3 | 9 | 10 | ||
| 6 | 4 | 0 | 0 | |
| - | 1 | 5 | 2 | 1 |
| 7 | 9 |
Subtract the numbers in the hundreds column from the top number:
13-5=8
| Place value | thousands | hundreds | tens | ones |
| 5 | 13 | |||
| 3 | 9 | 10 | ||
| 6 | 4 | 0 | 0 | |
| - | 1 | 5 | 2 | 1 |
| 8 | 7 | 9 |
Subtract the numbers in the thousands column from the top number:
5-1=4
| Place value | thousands | hundreds | tens | ones |
| 5 | 13 | |||
| 3 | 9 | 10 | ||
| 6 | 4 | 0 | 0 | |
| - | 1 | 5 | 2 | 1 |
| 4 | 8 | 7 | 9 |
The solution is: 4,879
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