Soluzione - Long subtraction
719,5
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones | . | tenths |
| 7 | 4 | 2 | |||
| - | 2 | 2 | , | 5 | |
| , |
Put zeros in the blank number places:
| Place value | hundreds | tens | ones | . | tenths |
| 7 | 4 | 2 | , | 0 | |
| - | 2 | 2 | , | 5 | |
| , |
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 (2) in the next number place which becomes (1) and get (10).
| Place value | hundreds | tens | ones | . | tenths |
| 1 | 10 | ||||
| 7 | 4 | 2 | , | 0 | |
| - | 2 | 2 | , | 5 | |
| , |
Subtract the numbers in the tenths column from the top number:
10-0-5=5
| Place value | hundreds | tens | ones | . | tenths |
| 1 | 10 | ||||
| 7 | 4 | 2 | , | 0 | |
| - | 2 | 2 | , | 5 | |
| , | 5 |
Because the upper digit (1) in the ones column is too small to get a positive difference, borrow 1 from the digit (4) in the next number place which becomes (3) and get (11).
| Place value | hundreds | tens | ones | . | tenths |
| 3 | 11 | ||||
| 1 | 10 | ||||
| 7 | 4 | 2 | , | 0 | |
| - | 2 | 2 | , | 5 | |
| , | 5 |
Subtract the numbers in the ones column from the top number:
11-2=9
| Place value | hundreds | tens | ones | . | tenths |
| 3 | 11 | ||||
| 1 | 10 | ||||
| 7 | 4 | 2 | , | 0 | |
| - | 2 | 2 | , | 5 | |
| 9 | , | 5 |
Subtract the numbers in the tens column from the top number:
3-2=1
| Place value | hundreds | tens | ones | . | tenths |
| 3 | 11 | ||||
| 1 | 10 | ||||
| 7 | 4 | 2 | , | 0 | |
| - | 2 | 2 | , | 5 | |
| 1 | 9 | , | 5 |
Write 7 in the hundreds place.
| Place value | hundreds | tens | ones | . | tenths |
| 3 | 11 | ||||
| 1 | 10 | ||||
| 7 | 4 | 2 | , | 0 | |
| - | 2 | 2 | , | 5 | |
| 7 | 1 | 9 | , | 5 |
The solution is: 719,5
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