Solution - Long subtraction
12.9
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 1 | 8 | . | 6 | |
| 1 | . | 2 | ||
| - | 4 | . | 5 | |
| . |
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 digit (8) in the next number place which becomes (7) and get (16).
| Place value | tens | ones | . | tenths |
| 7 | 16 | |||
| 1 | 8 | . | 6 | |
| 1 | . | 2 | ||
| - | 4 | . | 5 | |
| . |
Subtract the numbers in the tenths column from the top number:
16-2-5=9
| Place value | tens | ones | . | tenths |
| 7 | 16 | |||
| 1 | 8 | . | 6 | |
| 1 | . | 2 | ||
| - | 4 | . | 5 | |
| . | 9 |
Subtract the numbers in the ones column from the top number:
7-1-4=2
| Place value | tens | ones | . | tenths |
| 7 | 16 | |||
| 1 | 8 | . | 6 | |
| 1 | . | 2 | ||
| - | 4 | . | 5 | |
| 2 | . | 9 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths |
| 7 | 16 | |||
| 1 | 8 | . | 6 | |
| 1 | . | 2 | ||
| - | 4 | . | 5 | |
| 1 | 2 | . | 9 |
The solution is: 12.9
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