Solution - Long subtraction
11
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones |
| 3 | 2 | |
| - | 2 | 1 |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
2-1=1
| Place value | tens | ones |
| 3 | 2 | |
| - | 2 | 1 |
| 1 |
Subtract the numbers in the tens column from the top number:
3-2=1
| Place value | tens | ones |
| 3 | 2 | |
| - | 2 | 1 |
| 1 | 1 |
The solution is: 11
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