Solution - Long subtraction
9,999
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 |
| 1 | 0 | 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 (1,000) which becomes (0999) and get (10).
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 0 | 9 | 9 | 9 | 10 | |
| 1 | 0 | 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 |
| 0 | 9 | 9 | 9 | 10 | |
| 1 | 0 | 0 | 0 | 0 | |
| - | 1 | ||||
| 9 |
Write 9 in the tens place.
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 0 | 9 | 9 | 9 | 10 | |
| 1 | 0 | 0 | 0 | 0 | |
| - | 1 | ||||
| 9 | 9 |
Write 9 in the hundreds place.
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 0 | 9 | 9 | 9 | 10 | |
| 1 | 0 | 0 | 0 | 0 | |
| - | 1 | ||||
| 9 | 9 | 9 |
Write 9 in the thousands place.
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 0 | 9 | 9 | 9 | 10 | |
| 1 | 0 | 0 | 0 | 0 | |
| - | 1 | ||||
| 9 | 9 | 9 | 9 |
Write 0 in the ten thousands place.
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 0 | 9 | 9 | 9 | 10 | |
| 1 | 0 | 0 | 0 | 0 | |
| - | 1 | ||||
| 0 | 9 | 9 | 9 | 9 |
The solution is: 9,999
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