Find Least Common Multiple of 68 and 70 using ladder method..

LCM( 68, 70 ) = 2380

Step 1 : Place the numbers inside division bar:

Step 2 : Find a prime number which divides both numbers.

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

Step 4 : LCM is a product of numbers into L shape.

LCM = 2 · 34 · 35 = 2380

This solution can be visualized using a Venn diagram.

The LCM is equal to the product of all the numbers on the diagram.