Question

What are all the factors of 20

Answer 1

so a factor is all the numbers that can fit into 20 (I think, I might have this confused with multiples)
so 1 can go into 20, so can 2, not 3, but 4 can
so
1,2,4,5,10,20
(once you get halfway there (so 10 is half of twenty) you can stop because it wont go anymore)