Soluzione - Long subtraction
4,7
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 2 | 3 | , | 6 | |
| - | 1 | 8 | , | 9 |
| , |
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 (3) in the next number place which becomes (2) and get (16).
| Place value | tens | ones | . | tenths |
| 2 | 16 | |||
| 2 | 3 | , | 6 | |
| - | 1 | 8 | , | 9 |
| , |
Subtract the numbers in the tenths column from the top number:
16-9=7
| Place value | tens | ones | . | tenths |
| 2 | 16 | |||
| 2 | 3 | , | 6 | |
| - | 1 | 8 | , | 9 |
| , | 7 |
Because the upper digit (2) 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 (12).
| Place value | tens | ones | . | tenths |
| 1 | 12 | |||
| 2 | 16 | |||
| 2 | 3 | , | 6 | |
| - | 1 | 8 | , | 9 |
| , | 7 |
Subtract the numbers in the ones column from the top number:
12-8=4
| Place value | tens | ones | . | tenths |
| 1 | 12 | |||
| 2 | 16 | |||
| 2 | 3 | , | 6 | |
| - | 1 | 8 | , | 9 |
| 4 | , | 7 |
Subtract the numbers in the tens column from the top number:
1-1=0
| Place value | tens | ones | . | tenths |
| 1 | 12 | |||
| 2 | 16 | |||
| 2 | 3 | , | 6 | |
| - | 1 | 8 | , | 9 |
| 0 | 4 | , | 7 |
The solution is: 4,7
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