Soluzione - Long subtraction
85,3
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones | . | tenths |
| 1 | 0 | 3 | |||
| - | 1 | 7 | , | 7 | |
| , |
Put zeros in the blank number places:
| Place value | hundreds | tens | ones | . | tenths |
| 1 | 0 | 3 | , | 0 | |
| - | 1 | 7 | , | 7 | |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) 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 (10).
| Place value | hundreds | tens | ones | . | tenths |
| 2 | 10 | ||||
| 1 | 0 | 3 | , | 0 | |
| - | 1 | 7 | , | 7 | |
| , |
Subtract the numbers in the tenths column from the top number:
10-0-7=3
| Place value | hundreds | tens | ones | . | tenths |
| 2 | 10 | ||||
| 1 | 0 | 3 | , | 0 | |
| - | 1 | 7 | , | 7 | |
| , | 3 |
Because the upper digit (2) in the ones column is too small to get a positive difference, borrow 1 from the number to the left (10) which becomes (09) and get (12).
| Place value | hundreds | tens | ones | . | tenths |
| 0 | 9 | 12 | |||
| 2 | 10 | ||||
| 1 | 0 | 3 | , | 0 | |
| - | 1 | 7 | , | 7 | |
| , | 3 |
Subtract the numbers in the ones column from the top number:
12-7=5
| Place value | hundreds | tens | ones | . | tenths |
| 0 | 9 | 12 | |||
| 2 | 10 | ||||
| 1 | 0 | 3 | , | 0 | |
| - | 1 | 7 | , | 7 | |
| 5 | , | 3 |
Subtract the numbers in the tens column from the top number:
9-1=8
| Place value | hundreds | tens | ones | . | tenths |
| 0 | 9 | 12 | |||
| 2 | 10 | ||||
| 1 | 0 | 3 | , | 0 | |
| - | 1 | 7 | , | 7 | |
| 8 | 5 | , | 3 |
Write 0 in the hundreds place.
| Place value | hundreds | tens | ones | . | tenths |
| 0 | 9 | 12 | |||
| 2 | 10 | ||||
| 1 | 0 | 3 | , | 0 | |
| - | 1 | 7 | , | 7 | |
| 0 | 8 | 5 | , | 3 |
The solution is: 85,3
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