Solution - Long subtraction
19.8
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 2 | 1 | . | 1 | |
| - | 1 | . | 3 | |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (1) in the tenths column is too small to get a positive difference, borrow 1 from the digit (1) in the next number place which becomes (0) and get (11).
| Place value | tens | ones | . | tenths |
| 0 | 11 | |||
| 2 | 1 | . | 1 | |
| - | 1 | . | 3 | |
| . |
Subtract the numbers in the tenths column from the top number:
11-3=8
| Place value | tens | ones | . | tenths |
| 0 | 11 | |||
| 2 | 1 | . | 1 | |
| - | 1 | . | 3 | |
| . | 8 |
Because the upper digit (0) in the ones column is too small to get a positive difference, borrow 1 from the digit (2) in the next number place which becomes (1) and get (10).
| Place value | tens | ones | . | tenths |
| 1 | 10 | |||
| 0 | 11 | |||
| 2 | 1 | . | 1 | |
| - | 1 | . | 3 | |
| . | 8 |
Subtract the numbers in the ones column from the top number:
10-1=9
| Place value | tens | ones | . | tenths |
| 1 | 10 | |||
| 0 | 11 | |||
| 2 | 1 | . | 1 | |
| - | 1 | . | 3 | |
| 9 | . | 8 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths |
| 1 | 10 | |||
| 0 | 11 | |||
| 2 | 1 | . | 1 | |
| - | 1 | . | 3 | |
| 1 | 9 | . | 8 |
The solution is: 19.8
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