Their product.
The common denominator of 4/8 and 11/15 is 90.
LCD(15, 11) = 165.
165
1320
LCM(11, 13, 15) = 2145
1
The common denominator of 15 and 9 is 45.
The common denominator is 66.
A common denominator is 55.
What is the lowest common denominator of 15 over 57?
The greatest common denominator is infinite. The least common denominator is 45.
Common denominator is 15 so it would be 6/15 + 5/15 = 11/15