Solution - Long subtraction
9,990
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 9 | 9 | 9 | 9 | |
| - | 9 | |||
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
9-9=0
| Place value | thousands | hundreds | tens | ones |
| 9 | 9 | 9 | 9 | |
| - | 9 | |||
| 0 |
Write 9 in the tens place.
| Place value | thousands | hundreds | tens | ones |
| 9 | 9 | 9 | 9 | |
| - | 9 | |||
| 9 | 0 |
Write 9 in the hundreds place.
| Place value | thousands | hundreds | tens | ones |
| 9 | 9 | 9 | 9 | |
| - | 9 | |||
| 9 | 9 | 0 |
Write 9 in the thousands place.
| Place value | thousands | hundreds | tens | ones |
| 9 | 9 | 9 | 9 | |
| - | 9 | |||
| 9 | 9 | 9 | 0 |
The solution is: 9,990
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