Science, technology, engineering, and mathematics are the fastest-growing fields in terms of both student interest and job opportunities. For example, in California, the number of bachelor’s STEM degrees increased at a rate more than triple that of other degrees between 2010–11 and 2016–17. This is for good reason: studies show that STEM majors enjoy higher salaries and lower unemployment. The growth of STEM fields makes K–12 mathematics education more relevant than ever. Students without strong mathematical foundations will be shut out of these higher-paying and faster-growing fields. Hence, improving K–12 education, in particular for lower-income students and students of color, is of the utmost importance.