The LCD of 6/20, 9/5, 7/50, and 3/4 is:
A)5
B)4
C)20
D)50
E)100

Question

Quizplus · Accepted Answer

To find the LCD, we need to find the common multiples of the denominators and choose the least one. 
The multiples of 20 are: 20, 40, 60, 80, 100, 120, 140, 160, ...
The multiples of 5 are: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ...
The multiples of 50 are: 50, 100, 150, 200, 250, ...
The multiples of 4 are: 4, 8, 12, 16, 20, 24, 28, ...
The least common multiple that all of the denominators share is 100. Therefore, the LCD is 100.

The LCD of 6/20, 9/5, 7/50, and 3/4 Is