Solution - Long subtraction
18.6
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 2 | 0 | . | 5 | |
| - | 1 | . | 9 | |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (5) in the tenths column is too small to get a positive difference, borrow 1 from the number to the left (20) which becomes (19) and get (15).
| Place value | tens | ones | . | tenths |
| 1 | 15 | |||
| 2 | 0 | . | 5 | |
| - | 1 | . | 9 | |
| . |
Subtract the numbers in the tenths column from the top number:
15-9=6
| Place value | tens | ones | . | tenths |
| 1 | 15 | |||
| 2 | 0 | . | 5 | |
| - | 1 | . | 9 | |
| . | 6 |
Subtract the numbers in the ones column from the top number:
9-1=8
| Place value | tens | ones | . | tenths |
| 1 | 15 | |||
| 2 | 0 | . | 5 | |
| - | 1 | . | 9 | |
| 8 | . | 6 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths |
| 1 | 15 | |||
| 2 | 0 | . | 5 | |
| - | 1 | . | 9 | |
| 1 | 8 | . | 6 |
The solution is: 18.6
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