The math problems appear designed to be workable in your head, fitting the 3-answers-per-minute target: divisions come out as whole numbers, and in the last one

The math problems appear designed to be workable in your head, fitting the 3-answers-per-minute target: divisions come out as whole numbers, and in the last one with the scary occurrence of pi you don't need to use it (it cancels out -- and I like that, with the time constraint you need to be thinking on your feet). I also like that it's not multiple-choice. (But we're only seeing the first page of each section; I'll bet it gets harder.)