6 = 2 x 3
4 = 2 x 2
9 = 3 x 3
⇒ LCM is 2 x 2 x 3 x 3 x 7 = 252
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A common denominator, though not the least one, is 6*4 = 24.
If that's 3/4 and 5/6, the LCD is 12.
Sir/Ma'am, denominator are fractions, so the is no common denominator. But the least common multiples is 30
420
The Greatest Common Denominator is 2