You'll need at least two expressions to find something in common between them.
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The question refers to the "expression below". In such circumstances would it be too much to expect that you make sure that there is something that is below?
The least common denominator is 60.
a least common (LCD) denominator is a least common multiple (LCM); only it's a fraction and it's LCM is in the denominator's place.
The least common denominator for 9 and 10 is 90.
The least common denominator of 13 and 52 is52
The Least Common Denominator of 57 and 35 is 1.