the math question are really easy. i just add all the ones digits together(example: 44+55+73, i would do 4+5+3=12) and find the answer with the ones digit that is the same as my answer. because 12's ones digit is 2, i will find the answer with 2 in the ones digit. if there are 2 answers with the same ones digit as you, i just have to do all the work in my head.