I actually really liked doing these. It was kind of fun. I like learning how Mr.Dull could figure what number we picked so fast. They were a little difficult at first but by the end I had gotten the hang of it. You can do two things. Switch x and Y or look at the order of operations and take the opposite of them. I prefer taking the order of operations and doing the opposite. It is faster and because I know the order of operations extremely well it was easier for me to think about.