21
12
12
12
12
Same as finding the LCM of 6, 5, 7: 2*3*5*7 = 210
I am guessing you mean the least common denominator, which is the LCM of the denominators 4 and 20. The answer is 20.
LCM(5, 4, 3) = 60.
The LCM of 3 4 and 7 is 84.
The LCM of six, four and seven is eighty four.
To find the least common denominator of 3/4 and 3/8, find the LCM of 4 and 8. The answer is 8. Convert 3/4 to 6/8.
LCM(2, 3, 4) = 12.