The denominators 4, 3, 2, and 3 have least common denominator 12 To cause the denominator of to be 12 we multiply top and bottom by 3. To cause the denominator of to be 12 we multiply top and bottom by 4. To cause the denominator of to be 12 we multiply top and bottom by 6. To cause the denominator of to be 12 we multiply top and bottom by 4. Edwin