Welders use a variety of math skills on a daily basis, including basic arithmetic, algebra, geometry, and trigonometry. For example, welders may need to calculate the length of a cut by using basic math skills, or they may need to use trigonometry to determine the angles at which cuts should be made. Welders may also use more advanced math skills when working with complex shapes or when designing and creating custom products. In general, it is important for welders to have a strong foundation in math in order to be successful in their work.