Numerical
Part of speech: adjective
Definition: of or pertaining to numbers
Example sentence: I can well imagine that certain writers, even writers that we'd consider today very great writers, may not necessarily have tested highly on IQ just because of their numerical skills, or maybe they may not be very good at memory, and are not particularly good at these kinds of tests.
Mathematical
Part of speech: adjective
Definition: Of, or relating to mathematicsPossible but highly improbable
Example sentence: For me, I guess the main motivation is the satisfaction of finally understanding some tricky mathematical concept or phenomenon and then explaining it to others.