Solution - Long subtraction
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 2 | 2 | 3 | 6 | 8 | |
| - | 4 | 3 | 6 | 4 | 0 | |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
8-0=8
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 2 | 2 | 3 | 6 | 8 | |
| - | 4 | 3 | 6 | 4 | 0 | |
| 8 |
Subtract the numbers in the tens column from the top number:
6-4=2
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 2 | 2 | 3 | 6 | 8 | |
| - | 4 | 3 | 6 | 4 | 0 | |
| 2 | 8 |
Because the upper digit (3) in the hundreds 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 (13).
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | 13 | |||||
| 7 | 2 | 2 | 3 | 6 | 8 | |
| - | 4 | 3 | 6 | 4 | 0 | |
| 2 | 8 |
Subtract the numbers in the hundreds column from the top number:
13-6=7
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | 13 | |||||
| 7 | 2 | 2 | 3 | 6 | 8 | |
| - | 4 | 3 | 6 | 4 | 0 | |
| 7 | 2 | 8 |
Because the upper digit (1) in the thousands 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 | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | 11 | |||||
| 1 | 13 | |||||
| 7 | 2 | 2 | 3 | 6 | 8 | |
| - | 4 | 3 | 6 | 4 | 0 | |
| 7 | 2 | 8 |
Subtract the numbers in the thousands column from the top number:
11-3=8
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | 11 | |||||
| 1 | 13 | |||||
| 7 | 2 | 2 | 3 | 6 | 8 | |
| - | 4 | 3 | 6 | 4 | 0 | |
| 8 | 7 | 2 | 8 |
Because the upper digit (1) in the ten thousands column is too small to get a positive difference, borrow 1 from the digit (7) in the next number place which becomes (6) and get (11).
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 6 | 11 | |||||
| 1 | 11 | |||||
| 1 | 13 | |||||
| 7 | 2 | 2 | 3 | 6 | 8 | |
| - | 4 | 3 | 6 | 4 | 0 | |
| 8 | 7 | 2 | 8 |
Subtract the numbers in the ten thousands column from the top number:
11-4=7
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 6 | 11 | |||||
| 1 | 11 | |||||
| 1 | 13 | |||||
| 7 | 2 | 2 | 3 | 6 | 8 | |
| - | 4 | 3 | 6 | 4 | 0 | |
| 7 | 8 | 7 | 2 | 8 |
Write 6 in the hundred thousands place.
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 6 | 11 | |||||
| 1 | 11 | |||||
| 1 | 13 | |||||
| 7 | 2 | 2 | 3 | 6 | 8 | |
| - | 4 | 3 | 6 | 4 | 0 | |
| 6 | 7 | 8 | 7 | 2 | 8 |
The solution is: 678,728
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