Good places to find sources for Mathematics:

Ontario Curriculum

• The Ontario Curriculum: Grade 9 
• Ontario Curriculum – Grade 10 Math
• The Ontario Curriculum, Grades 11 and 12: Mathematics, 2007

• Library Learning Commons
• Academic One File (GALE)
• Britannica School
• The Canadian Encyclopedia
• Google Scholar
• JSTOR

• List of Math Scholarly Journals 

• Encyclopedia of Mathematics 
• Wolfram Mathworld 
• The arXiv (a free online database with publications relating to physics, computer sciences, mathematics, finance and biology)
• Khan Academy 

• Math Homework Help – TVO Mathify
• IXL – Grade 9 Math
• Purple Math 
• Wired Math
• Mathies

• Math Homework Help – TVO Mathify
• IXL – Grade 10 Math
• Purple Math 
• Wired Math
• Mathies