Write 20/66 in simplest form

20/66 divided by 2 = 10/33

To get 20/66 in its simplest form, half each of the numbers. Which then, you get 10/33. You can't make it anymore simpler because then, both of the numbers have to be even so you can half them. Because a very important rule is, whatever you do with one number, you have to do it to the other.