XtraMath | 1,124 followers on LinkedIn. XtraMath®is a 501(c)(3) nonprofit organization dedicated to math achievement for all. | XtraMath is a 501(c)(3) nonprofit organization that provides an online supplemental math program for students in grades K-8. Our online math fact fluency program helps students develop fluency with addition, subtraction, multiplication, and division facts and build the computational memory that enables greater success in higher-level mathematics. XtraMath started in the fall of 2007 when David Jeschke, a computer programmer, volunteered at a local elementary school and recognized the need for an individualized math practice program.