Solution - Long subtraction
17.5
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 1 | 9 | . | 6 | |
| - | 2 | . | 1 | |
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the tenths column from the top number:
6-1=5
| Place value | tens | ones | . | tenths |
| 1 | 9 | . | 6 | |
| - | 2 | . | 1 | |
| . | 5 |
Subtract the numbers in the ones column from the top number:
9-2=7
| Place value | tens | ones | . | tenths |
| 1 | 9 | . | 6 | |
| - | 2 | . | 1 | |
| 7 | . | 5 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths |
| 1 | 9 | . | 6 | |
| - | 2 | . | 1 | |
| 1 | 7 | . | 5 |
The solution is: 17.5
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