Answer
$\{1,2,3,4,5,6,10,12,15,20,25,30,50,60,75,100,150,300\}$
Work Step by Step
To list the factors of a number, we list all of the whole numbers that we can multiply to get the number. In the case of the number $300$, the factors are $\{1,2,3,4,5,6,10,12,15,20,25,30,50,60,75,100,150,300\}$.