What is the gcf of 18a and 20ab

It is 2a

Step-by-step explanation:

Ok the greatest common factor is the number and/or term common to a seri3s of values so you separate them

the GCF of 18 and 20 is 2

and you also have a and ab

now, what is common to them both

a

so you would get the gcf as 2a so it would be written as 2a (9+10b)

2

Step-by-step explanation:

the biggest number they can both divide by is 2.