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This is done when subtracting mixed fractions. Here you subtract the whole part and the fractional part separately; but if you have a case such as, for example,

5 2/6 - 3 3/6

in the first number, you can "borrow" one whole, which in this case is equal to 6/6; that is, you subtract it from the whole part and add it to the fractional part, thus converting the subtraction to:

4 8/6 - 3 3/6

Now you should have no trouble subtracting the whole part and the fractional part separately.

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10y ago
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Q: How do you borrow fractions?
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