Core-Plus Mathematics is a comprehensive high school mathematics program consisting of a four-year series of print and digital student textbooks and supporting materials for teachers, developed by the Core-Plus Mathematics Project at , with funding from the . Each text consists of a significant common core of mathematics and statistics for all students, extensions of core content to challenge the most motivated and able students. The Core-Plus development team consists of mathematics educators, mathematicians, and statisticians from several U.S. universities.
Houghton Mifflin has now published assessments to complement the On Core Mathematics program. There is an assessment for every lesson in the student books. Each assessment is three to five questions in length (1 page), and includes both fill-in-the-bubble multiple choice questions and at least one word problem. Each assessment is labeled for the corresponding standard, and the answer key is found at the back of the book. The purchaser is given permission for copying if using On Core Mathematics as a program.