Homework Help - a free online math help resource for students in Grades 7 - 10 (available Sun. - Thurs. 5:30 pm to 9:30 pm)
Note: Homework Help is funded by the Ontario government and administered by TVO's Independent Learning Centre.
EQAO - Resources for Grade 9 students in preparation for EQAO Math Assessment
Khan Academy Videos - outstanding online lessons (presented via YouTube) for most topics in high school mathematics
Desmos - a free online graphing calculator
CEMC - Centre for Education in Mathematics and Computing
Provides excellent resources for math enrichment including contest preparation and Problem of the Week.
Wolfram Alpha - a computational knowledge engine