"At the same time I found being able to read and knowing basic math useful, but that's just me."
According to the National Center for Education Stastistics, only 4% of high school graduates are able to read proficiently. (And by proficiently, they mean having the minimum amount of skill necessary to 'compare viewpoints in two editorials' or 'interpret a table about blood pressure, age, and physical activity', i.e. an extremely low bar.)