 YourTeacher  Classmate, L.L.C.
Hundreds of online math lessons by a former high school math teacher. Search by course, keyword, or textbook. Freely sample some content; subscribe for full access, plus diagnostic pretests, tools to track progress and performance, and grade reports.
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 Zen Calculus: A Short, Easy Introduction to Calculus  Peter McCauley
An 11page PDF file that establishes the fundamentals of calculus without using infinite series or limits. Suitable for high school students with one year of algebra.
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 ZeroKnowledge Proofs  John Scammell
"Random thoughts about teaching math" from a high school math consultant who taught math for 18 years prior. Scammell's blog posts, which date back to May, 2010, have included "Lecture Method vs. Peer Instruction," "Mozart’s Dice Game," "Let the Kids
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 Zimaths  University of Zimbabwe
An electronic maths magazine with clever, amusing articles written to supplement the resources available to Zimbabwean students, most of whom do not have access to extrasyllabus information. Features include: How number plates and ISBNs work; Statistical
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 Zoom Math  I.Q. Joe
The makers of Zoom Algebra, an application with an intuitive visual interface and numerous typing shortcuts. Their apps for TI83 Plus or TI84 Plus graphing calculators let you "type problems in just the way they look in your textbook, and then they
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