how do you figure out the lcd of problems plz i seriuosly need help in it.?

Answer 1

One way is to take all the multiples of each denominator and find the lowest common one.

For example, if you have 2 and 5 as the denominators:

Multiples of 2:
2, 4, 6, 8, 10, 12, 14, etc.
Multiples of 5:
5, 10, 15, 20, etc.

The first common multiple is 10, so the lcd would be 10.

Another way is to figure the prime factors of each denominator. So if you had 12 and 30, you would get their prime factors as follows:

12 / 2 = 6
6 / 2 = 3
3 / 3 = 1
So 12 = 2 x 2 x 3

30 / 2 = 15
15 / 3 = 5
5 / 5 = 1
So 30 = 2 x 3 x 5

Now take enough prime factors to make both numbers. You need two 2s (2 x 2) one 3 (3) and one 5 (5).
2 x 2 x 3 x 5 = 60

So the lcd of 12 and 30 is 60.

Answer 2

least common denomentators are the lowest same numbers you can get on the bottom of the fractions. An esy way is list all of the multiples of one denomenator and do the same for the other. then find the first one they have in common. that is the LCD

Answer 3

Finding the lowest common denominator
read the step by step here --> http://www.mathwizz.com/fractions/help/help2.htm