How do i find gcf and lcm?

GCF

factor them and find the group of factors common to both

example

18 and 24

18=2*3*3

24=2*2*2*3

common group is 2*3 or 6

gcf=6

LCM=least common multiupule

means smallest number that both can go into evenly

factor them and make a group that includes both of them, if you have repeats, replace them

18 and 24

18=2*3*3

24=2*2*2*3

LCM=2*2*2*3*3=72