Question

find the least common multiple to determine the least common denominator for 2 over 3, 5 over 6, and 9 over 4

Answer 1

you want LCM for  3,6 and 9

3 = 1*3
6 = 2*3
9 = 3*3*3

Note that one 3 is common to all 3 factors.

LCM = 2*3*3  = 18