Find Least Common Multiple of 14, 7, 4 and 2 using ladder method..

LCM( 14, 7, 4, 2 ) = 28

Step 1 : Place the numbers inside division bar:

Step 2 : Find a prime number which can divide at least two of your numbers.

In this example we can divide by 2. If any number is not divisible by 2 write it down unchanged.

Step 3 : Repeat Step 2 until you can no longer divide.

Since there are no primes that divides at least two of given numbers, we conclude that the LCM is a product of starting numbers.

LCM = 14 · 7 · 4 · 2 = 28