Solution - Long subtraction
2,991
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 3 | 0 | 2 | 1 | |
| 6 | ||||
| - | 2 | 4 | ||
2. Subtract the numbers using long subtraction method
Because the upper digit (1) in the ones column is too small to get a positive difference, borrow 1 from the digit (2) in the next number place which becomes (1) and get (11).
| Place value | thousands | hundreds | tens | ones |
| 1 | 11 | |||
| 3 | 0 | 2 | 1 | |
| 6 | ||||
| - | 2 | 4 | ||
Subtract the numbers in the ones column from the top number:
11-6-4=1
| Place value | thousands | hundreds | tens | ones |
| 1 | 11 | |||
| 3 | 0 | 2 | 1 | |
| 6 | ||||
| - | 2 | 4 | ||
| 1 |
Because the upper digit (1) in the tens column is too small to get a positive difference, borrow 1 from the number to the left (30) which becomes (29) and get (11).
| Place value | thousands | hundreds | tens | ones |
| 2 | 9 | 11 | ||
| 1 | 11 | |||
| 3 | 0 | 2 | 1 | |
| 6 | ||||
| - | 2 | 4 | ||
| 1 |
Subtract the numbers in the tens column from the top number:
11-2=9
| Place value | thousands | hundreds | tens | ones |
| 2 | 9 | 11 | ||
| 1 | 11 | |||
| 3 | 0 | 2 | 1 | |
| 6 | ||||
| - | 2 | 4 | ||
| 9 | 1 |
Write 9 in the hundreds place.
| Place value | thousands | hundreds | tens | ones |
| 2 | 9 | 11 | ||
| 1 | 11 | |||
| 3 | 0 | 2 | 1 | |
| 6 | ||||
| - | 2 | 4 | ||
| 9 | 9 | 1 |
Write 2 in the thousands place.
| Place value | thousands | hundreds | tens | ones |
| 2 | 9 | 11 | ||
| 1 | 11 | |||
| 3 | 0 | 2 | 1 | |
| 6 | ||||
| - | 2 | 4 | ||
| 2 | 9 | 9 | 1 |
The solution is: 2,991
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