Factors are numbers that divide evenly into a number
best way to do it start at 1 and go up
example 24
1 and 24
2 and 12
3 and 8
4 and 6
5 and (that's doesn't go in evenly so it not a factor)
6 and 4 and when they repeat like this, stop
Now list all your numbers
1, 2, 3, 4, 6, 8, 12, 24 and the factors of 24