Solution - Long subtraction
23.9
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 9 | 0 | . | 6 | |
| - | 6 | 6 | . | 7 |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (6) in the tenths column is too small to get a positive difference, borrow 1 from the number to the left (90) which becomes (89) and get (16).
| Place value | tens | ones | . | tenths |
| 8 | 16 | |||
| 9 | 0 | . | 6 | |
| - | 6 | 6 | . | 7 |
| . |
Subtract the numbers in the tenths column from the top number:
16-7=9
| Place value | tens | ones | . | tenths |
| 8 | 16 | |||
| 9 | 0 | . | 6 | |
| - | 6 | 6 | . | 7 |
| . | 9 |
Subtract the numbers in the ones column from the top number:
9-6=3
| Place value | tens | ones | . | tenths |
| 8 | 16 | |||
| 9 | 0 | . | 6 | |
| - | 6 | 6 | . | 7 |
| 3 | . | 9 |
Subtract the numbers in the tens column from the top number:
8-6=2
| Place value | tens | ones | . | tenths |
| 8 | 16 | |||
| 9 | 0 | . | 6 | |
| - | 6 | 6 | . | 7 |
| 2 | 3 | . | 9 |
The solution is: 23.9
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