Working for the Math Department
The math department hires undergraduates for several types of positions.
Graders assist professors in the grading of homework and quizzes; they are usually hired at the beginning of the semester. If you are interested, make sure you have an updated application on file in the math office.
The web page about the Math Learning Center and Math @ Mansfield has information about math tutor positions.
Of course, you can also tutor students privately. If you wish, math office staff can put your name, contact info and hourly charge on a tutor list that is available on the math department website.