Let us take an example
If you want to find the Lcm of 5,12,15
Step1:first take the largest digit I,e 15
Step2 :you have to take multiples of 15
For example:15,30,45,60,75,90...............
Step 3:take that multiple of 15 which is also multiple of other two digits
For example 60 is multiple of 15 but also multiple of 5 and 12
60 will be ur answer
Thank you