Educators should be aware that, with the exception of the Grade 9 mathematics course, 2021 (MTH1W), the 2005 Mathematics curriculum for Grade 10 and the 2007 Mathematics curriculum for Grades 11–12 remain in effect. All secondary mathematics courses for Grades 10–12 will continue to be based on those documents. All references to Grade 9 that appear in The Ontario Curriculum, Grades 9 and 10: Mathematics, 2005 and The Ontario Curriculum, Grades 11 and 12: Mathematics, 2007 have been superseded by The Ontario Curriculum, Grade 9: Mathematics, 2021. Addenda have been issued to the Grade 10 MPM2D and MFM2P courses, to be implemented for the 2022–23 school year.
Addenda for each of the Grade 10 Academic and Applied Mathematics courses outline additional learning expectations that support students in their transition from the new de-streamed Grade 9 Mathematics course (MTH1W) to the current Grade 10 Mathematics courses.