How to get the LCD easily:

Three numbers are shown below.

3      3      3
4     14     7

Now. The last thing you need to do is find their exact alike denominator using LCD. (at where they have the same number is where i will stop.)

4=4, 8 ,12, 16, 20, 24, 28................
14=14, 28..........
7=7, 14, 21, 28................

So 28 is their common denominator. Or you can do it this the most easiest way:

These are the 3 numbers again. all you have to do is to multiply those 2 lesser numbers into the exact amount they would be with the biggest denominator:

4 x 7= 28

so they already have the same denominator because in these second one you just needed to multiply the lower number with the second lower number to be equal LCD.

yeah..thats what im i think thats two is the common way to get the LCD . thanks for info.
the second one is more easier to use