LCM B4

Find the LCM of 30 and 40 

Solution 

2	30	40
2	15	20
2	15	10
3	15	5
5	5	5
	1	1

LCM = 2 x 2 x 3 x 5 x 11

        = 4 x 165  (because 3 x 5 x 11=165)

        = 330

Hence LCM is 330