Question

Malcolm is so good at math that he can do most calculations in his head. It's very rare that he has to use a pencil and paper to answer a math problem. What should Malcolm remember to do when taking math tests?
A. have his calculator at hand just in case he needs it
B. explain in short-answer format how he knew the right answer
C. show his work so he doesn't get points taken off
D. preview the test when he first receives it

Answer 1

C. Show his work so he doesn't get points taken off

Note how it says he can do "most" calculations, its best to always show work so it shows that you didn't cheat as well as it helping make you more likely to get that answer correct.