Solution - Long subtraction
60
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones |
| 6 | 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 | tens | ones |
| 6 | 9 | |
| - | 9 | |
| 0 |
Write 6 in the tens place.
| Place value | tens | ones |
| 6 | 9 | |
| - | 9 | |
| 6 | 0 |
The solution is: 60
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