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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 | |
| 3 | . | 8 | ||
| - | 1 | 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 2 from the number to the left (20) which becomes (18) and get (25).
| Place value | tens | ones | . | tenths |
| 1 | 25 | |||
| 2 | 0 | . | 5 | |
| 3 | . | 8 | ||
| - | 1 | 1 | . | 9 |
| . |
Subtract the numbers in the tenths column from the top number:
25-8-9=8
| Place value | tens | ones | . | tenths |
| 1 | 25 | |||
| 2 | 0 | . | 5 | |
| 3 | . | 8 | ||
| - | 1 | 1 | . | 9 |
| . | 8 |
Subtract the numbers in the ones column from the top number:
8-3-1=4
| Place value | tens | ones | . | tenths |
| 1 | 25 | |||
| 2 | 0 | . | 5 | |
| 3 | . | 8 | ||
| - | 1 | 1 | . | 9 |
| 4 | . | 8 |
Subtract the numbers in the tens column from the top number:
1-1=0
| Place value | tens | ones | . | tenths |
| 1 | 25 | |||
| 2 | 0 | . | 5 | |
| 3 | . | 8 | ||
| - | 1 | 1 | . | 9 |
| 0 | 4 | . | 8 |
The solution is: 4.8
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