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5 factors into 1 and 5 6 factors into 2 and 3 Therefore, the least common multiple is 1*2*3*5 = 30 This is what you would use for the LCD, convert the fifths and sixths into thirtieths.
2/12=1/6 The LCD of 1/6 and 3/4=The LCD of 1/6 and 1/4=12 Therefore, 2/12 and 9/12 have the same denominator. They are equal to the original fractions. LCD=12
If that's 84 and 35, the LCD is 420.If that's 8/4 and 3/5, the LCD is 20.
You need at least two fractions to find a common denominator.