LCM by Division Method

1) Find LCM of three numbers 20, 40, 60 through the division method.

Divide all the numbers same time by lowest/smallest prime number, which can divide at least one number and convert the number at that position which can not be divided further –

Continue division by the possible smallest common prime numbers till the last step whether the last row contains prime numbers.

On the next step multiply all the factors and the prime numbers of the last row to get LCM.

So, LCM of these three numbers – 2 x 2 x 5 x 1 x 2 x 3 = 120  (Ans.)