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long subtraction −0.25+0.5
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Solution
0.25
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0.5−0.25
Write the numbers one under the other, line up the decimal points. Add trailing zeroes so the numbers have the same length.
0
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5
0
−
0
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2
5
Subtract each column of digits, starting from the right and working left If the digit being subtracted is larger than the digit above it, 'borrow' a digit from the next column to the left.
In the bolded column, subtract the second digit from the first
0
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5
0
−
0
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2
5
The bottom number is larger than the upper number. Try to 'borrow' a digit from the left.
Borrow 1 from 5. The remainder is 4
4
10
0
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5
0
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0
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2
5
Add 1 ten to 0: 10+0=10
4
10
0
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5
0
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0
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2
5
In the bolded column, subtract the second digit from the first: 10−5=5
4
10
0
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5
0
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0
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2
5
5
In the bolded column, subtract the second digit from the first: 4−2=2
4
10
0
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5
0
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0
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2
5
2
5
Place the decimal point in the answer directly below the decimal points in the terms
4
10
0
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5
0
−
0
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2
5
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2
5
In the bolded column, subtract the second digit from the first: 0−0=0