The best common denominator is 1
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A few synonyms for common denominator are , common divisor, common measure, denominator, numerator
Addition and subtraction are the only fraction operations that need a common denominator. Multiplication, division, and exponents do not need a common denominator. In fact, it is best to use reduced fractions otherwise it gets very messy.
A common denominator of 20 and 30 is 600. This is NOT the least common denominator, though.
The greatest common denominator is infinite. The least common denominator is 45.
A common denominator, though not the least, is 80.