Solution - Long subtraction
11.1
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 1 | 2 | . | 9 | |
| - | 1 | . | 8 | |
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the tenths column from the top number:
9-8=1
| Place value | tens | ones | . | tenths |
| 1 | 2 | . | 9 | |
| - | 1 | . | 8 | |
| . | 1 |
Subtract the numbers in the ones column from the top number:
2-1=1
| Place value | tens | ones | . | tenths |
| 1 | 2 | . | 9 | |
| - | 1 | . | 8 | |
| 1 | . | 1 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths |
| 1 | 2 | . | 9 | |
| - | 1 | . | 8 | |
| 1 | 1 | . | 1 |
The solution is: 11.1
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