Solution - Long subtraction
21.6
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 3 | 8 | . | 9 | |
| - | 1 | 7 | . | 3 |
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the tenths column from the top number:
9-3=6
| Place value | tens | ones | . | tenths |
| 3 | 8 | . | 9 | |
| - | 1 | 7 | . | 3 |
| . | 6 |
Subtract the numbers in the ones column from the top number:
8-7=1
| Place value | tens | ones | . | tenths |
| 3 | 8 | . | 9 | |
| - | 1 | 7 | . | 3 |
| 1 | . | 6 |
Subtract the numbers in the tens column from the top number:
3-1=2
| Place value | tens | ones | . | tenths |
| 3 | 8 | . | 9 | |
| - | 1 | 7 | . | 3 |
| 2 | 1 | . | 6 |
The solution is: 21.6
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