Solution - Long subtraction
12.6
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 1 | 7 | . | 2 | |
| 0 | . | 8 | ||
| - | 3 | . | 8 | |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (2) in the tenths column is too small to get a positive difference, borrow 2 from the digit (7) in the next number place which becomes (5) and get (22).
| Place value | tens | ones | . | tenths |
| 5 | 22 | |||
| 1 | 7 | . | 2 | |
| 0 | . | 8 | ||
| - | 3 | . | 8 | |
| . |
Subtract the numbers in the tenths column from the top number:
22-8-8=6
| Place value | tens | ones | . | tenths |
| 5 | 22 | |||
| 1 | 7 | . | 2 | |
| 0 | . | 8 | ||
| - | 3 | . | 8 | |
| . | 6 |
Subtract the numbers in the ones column from the top number:
5-0-3=2
| Place value | tens | ones | . | tenths |
| 5 | 22 | |||
| 1 | 7 | . | 2 | |
| 0 | . | 8 | ||
| - | 3 | . | 8 | |
| 2 | . | 6 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths |
| 5 | 22 | |||
| 1 | 7 | . | 2 | |
| 0 | . | 8 | ||
| - | 3 | . | 8 | |
| 1 | 2 | . | 6 |
The solution is: 12.6
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