2.0 Doesn't remain 2.0. You have the right idea. 2.0 has to be converted into a whole number, which requires moving the decimal 1 spot to the right. You have to do the same to 1.6 as well. 20 doesn't go into 16 so that is 0. In order to get a answer another 0 has to be attached to the 16, so it would become 160/20 which is 8 times. Move the decimal straight up and the answer is 0.8.
I'm not a math teacher or anything so I don't know how to explain it with proper terms. Sorry.