Soluzione - Long subtraction
20,47
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
Place value | tens | ones | . | tenths | hundredths |
2 | 9 | , | 3 | 7 | |
- | 8 | , | 9 | ||
, |
Put zeros in the blank number places:
Place value | tens | ones | . | tenths | hundredths |
2 | 9 | , | 3 | 7 | |
- | 8 | , | 9 | 0 | |
, |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the hundredths column from the top number:
7-0=7
Place value | tens | ones | . | tenths | hundredths |
2 | 9 | , | 3 | 7 | |
- | 8 | , | 9 | 0 | |
, | 7 |
Because the upper digit (3) in the tenths column is too small to get a positive difference, borrow 1 from the digit (9) in the next number place which becomes (8) and get (13).
Place value | tens | ones | . | tenths | hundredths |
8 | 13 | ||||
2 | 9 | , | 3 | 7 | |
- | 8 | , | 9 | 0 | |
, | 7 |
Subtract the numbers in the tenths column from the top number:
13-9=4
Place value | tens | ones | . | tenths | hundredths |
8 | 13 | ||||
2 | 9 | , | 3 | 7 | |
- | 8 | , | 9 | 0 | |
, | 4 | 7 |
Subtract the numbers in the ones column from the top number:
8-8=0
Place value | tens | ones | . | tenths | hundredths |
8 | 13 | ||||
2 | 9 | , | 3 | 7 | |
- | 8 | , | 9 | 0 | |
0 | , | 4 | 7 |
Write 2 in the tens place.
Place value | tens | ones | . | tenths | hundredths |
8 | 13 | ||||
2 | 9 | , | 3 | 7 | |
- | 8 | , | 9 | 0 | |
2 | 0 | , | 4 | 7 |
The solution is: 20,47
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