When the numerator is less than the denominator then it is a common fraction but if the numerator is greater than the denominator then it is an improper fraction.
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The least common denominator is the least common multiple of the denominators of the fractions.
you have to compare the common fractions
Multiplying the denominators together of two or more unlike fractions will get you a common multiple.
The LCD for fractions is the LCM (least common multiple) of all of the denominators.
Finding the lowest common denominator