This probably depends on the questions. When applying for a college math professor job, it's understandable that you'll use mathematica/matlab/whatever for mos

This probably depends on the questions. When applying for a college math professor job, it's understandable that you'll use mathematica/matlab/whatever for most of actual work, but needing a calculator for simple mutliplication-table style calculations would be a red flag. Especially if there is lecturing involved.