Hell! I would love to help!
A factor is a a number or quantity that when multiplied with another produces a given number or expression.
So, we need to find numbers that can be multiplied together to create 12.
1 and 12 create 12 when multiplied, so they are factors.
3 and 4 create 12 when multiplied, so they are factors.
2 and 6 create 12 when multiplied, so they are factors.
So, therefore, your answers (in order from least to greasers are 1,2,3,4,6,12)
Hope this helped! Comment if you have any questions!