factors go into these numbers evenly. Lets start with 6 and try some numbers
1 goes into 6 6 times
2 goes into 6 3 times
3 goes into 6 2 times
4 does not go into 6
5 does not go into 6
6 goes into 6 1 time
So the factors are 1,2,3 and 6
let's try 8 the same way
1 goes into 8 8 times
2 goes into 8 4 times
3 does not go into 8
4 goes into 8 2 times
5 does not go into 8
6 does not go into 8
7 does not go into 8
8 goes into 8 1 time
so the factors are 1,2,4 and 8