The LCM of 5 and 4 is 20, this is the denominator. Dividing by fractions. Dividing by a number is equivalent to multiplying by the reciprocal of that number. But what's a reciprocal? The ...
The method to divide fractions is to keep the first fraction the same, turn the divide sign into a multiply and turn the second fraction upside down. This is known as multiplying by the reciprocal.
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