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Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| 1 | 9 | 9 | |
| 1 | |||
| - | 1 | 1 | |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
9-1-1=7
| Place value | hundreds | tens | ones |
| 1 | 9 | 9 | |
| 1 | |||
| - | 1 | 1 | |
| 7 |
Subtract the numbers in the tens column from the top number:
9-1=8
| Place value | hundreds | tens | ones |
| 1 | 9 | 9 | |
| 1 | |||
| - | 1 | 1 | |
| 8 | 7 |
Write 1 in the hundreds place.
| Place value | hundreds | tens | ones |
| 1 | 9 | 9 | |
| 1 | |||
| - | 1 | 1 | |
| 1 | 8 | 7 |
The solution is: 187
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