Explanation:
Make a line like that and add the numbers 6 and 9 ( order doesn't matter).
then look for a number that can divide both of them without a remainder first which is 3.
Divide 6 and write the Answer down under it
Divide name and write the answer under it.
look for another number that can divide those answers you got. but they aren't no numbers that can divide them without remainders anymore, so you divide 2 by 2 and write down 1 and just write down the 3 back .
then divide 3 by 3 and write down the answer which is one beneath it.
(you should keep dividing until you get everything to 1)
Then multiply together all the numbers used in dividing and that is your L.C.M.
Hope this helps.
Good luck ✅.