Solution - Long subtraction
79,999
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 |
| 9 | 0 | 0 | 0 | 0 | |
| - | 1 | 0 | 0 | 0 | 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 (9,000) which becomes (8,999) and get (10).
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 8 | 9 | 9 | 9 | 10 | |
| 9 | 0 | 0 | 0 | 0 | |
| - | 1 | 0 | 0 | 0 | 1 |
Subtract the numbers in the ones column from the top number:
10-1=9
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 8 | 9 | 9 | 9 | 10 | |
| 9 | 0 | 0 | 0 | 0 | |
| - | 1 | 0 | 0 | 0 | 1 |
| 9 |
Subtract the numbers in the tens column from the top number:
9-0=9
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 8 | 9 | 9 | 9 | 10 | |
| 9 | 0 | 0 | 0 | 0 | |
| - | 1 | 0 | 0 | 0 | 1 |
| 9 | 9 |
Subtract the numbers in the hundreds column from the top number:
9-0=9
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 8 | 9 | 9 | 9 | 10 | |
| 9 | 0 | 0 | 0 | 0 | |
| - | 1 | 0 | 0 | 0 | 1 |
| 9 | 9 | 9 |
Subtract the numbers in the thousands column from the top number:
9-0=9
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 8 | 9 | 9 | 9 | 10 | |
| 9 | 0 | 0 | 0 | 0 | |
| - | 1 | 0 | 0 | 0 | 1 |
| 9 | 9 | 9 | 9 |
Subtract the numbers in the ten thousands column from the top number:
8-1=7
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 8 | 9 | 9 | 9 | 10 | |
| 9 | 0 | 0 | 0 | 0 | |
| - | 1 | 0 | 0 | 0 | 1 |
| 7 | 9 | 9 | 9 | 9 |
The solution is: 79,999
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