Step-by-step explanation:
A method for this would be the tree diagram
20
/. \
10 x 2 ( u circle 2,times with 1 will times into itself)
/ \. (nothing goes into 2)
5x2 (same goes for 5 and the rest)
5x2x2= 20
3. (cant times into itself)
so 2x5x3 = 30
LCM = 30
