Question

What is the LCD of 2/3, 4/5, and 7/10?
A.30
B.18
C.15
D.10

Answer 1

The Prime Factorization of 3,5,10 is:

3 = 1 x 3
5 = 1 x 5
10 = 2 x 5

Lets Multiply it:
We already have a 5, so we can only use one of the fives.

1 x 1 x 2 x 3 x 5 = 30 

the answer is 30

Answer 2

The Prime Factorization of 3,5,10 is:

3 = 1 x 3

5 = 1 x 5

10 = 2 x 5

Lets Multiply it:

We already have a 5, so we can only use one of the fives.

1 x 1 x 2 x 3 x 5 = 30  so 30 is the answer.