140
The LCD of 7 and 77 is 77.
Multiply them together.
15
The LCD for 4/7 and 3/5 is 35.
28.
LCD(7, 5, 10) = 10
LCD(7, 4) = 28
The LCD of x, 5, 7, 15 is 105x.
LCD(5, 7, 25) = 175
The LCD of 567 and 5 is 2835The LCD of 5, 6, 7 and 5 is 210
You need at least two fractions to find an LCD. If that's 5/7 and 1/2, the LCD is 14.
The LCD, or Lowest Common Denominator, is the smallest multiple of each of the denominators of a set of fractions. So, assuming that 2, 4 and 5 are denominators of fractions (1/2, 1/4 and 1/5, for example), the LCD would be 20, because 20 is the lowest number that 2, 4 and 5 multiply into. So, your new fractions would be 10/20, 5/20 and 4/20. The purpose of finding the LCD is to allow for multiplying fractions together, or simply comparing them easily.