Soluzione - Long subtraction
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 4 | 2 | , | 4 | ||
| - | 3 | , | 7 | 1 | |
| , |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths |
| 4 | 2 | , | 4 | 0 | |
| - | 3 | , | 7 | 1 | |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the hundredths 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 (10).
| Place value | tens | ones | . | tenths | hundredths |
| 3 | 10 | ||||
| 4 | 2 | , | 4 | 0 | |
| - | 3 | , | 7 | 1 | |
| , |
Subtract the numbers in the hundredths column from the top number:
10-0-1=9
| Place value | tens | ones | . | tenths | hundredths |
| 3 | 10 | ||||
| 4 | 2 | , | 4 | 0 | |
| - | 3 | , | 7 | 1 | |
| , | 9 |
Because the upper digit (3) 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 (13).
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 13 | ||||
| 3 | 10 | ||||
| 4 | 2 | , | 4 | 0 | |
| - | 3 | , | 7 | 1 | |
| , | 9 |
Subtract the numbers in the tenths column from the top number:
13-7=6
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 13 | ||||
| 3 | 10 | ||||
| 4 | 2 | , | 4 | 0 | |
| - | 3 | , | 7 | 1 | |
| , | 6 | 9 |
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 | tens | ones | . | tenths | hundredths |
| 3 | 11 | ||||
| 1 | 13 | ||||
| 3 | 10 | ||||
| 4 | 2 | , | 4 | 0 | |
| - | 3 | , | 7 | 1 | |
| , | 6 | 9 |
Subtract the numbers in the ones column from the top number:
11-3=8
| Place value | tens | ones | . | tenths | hundredths |
| 3 | 11 | ||||
| 1 | 13 | ||||
| 3 | 10 | ||||
| 4 | 2 | , | 4 | 0 | |
| - | 3 | , | 7 | 1 | |
| 8 | , | 6 | 9 |
Write 3 in the tens place.
| Place value | tens | ones | . | tenths | hundredths |
| 3 | 11 | ||||
| 1 | 13 | ||||
| 3 | 10 | ||||
| 4 | 2 | , | 4 | 0 | |
| - | 3 | , | 7 | 1 | |
| 3 | 8 | , | 6 | 9 |
The solution is: 38,69
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