University of Saskatchewan (Canada)
University of Saskatchewan: Triangles
This site from the University of Saskatchewan provides an explanation of similar triangles, the Pythagorean theorem, and the distance between arbitrary points in a plane. Example problems for each of these concepts are provided.
Other
Math Mistakes: Common Algebra Mistakes
Learn from other student's mistakes by reviewing examples of the following Algebra topics: rational expressions, radical expressions, function notation, solving linear equations, solving linear inequalities, solving quadratic equations,...
CK-12 Foundation
Ck 12: Analysis: Positions and Midpoints in Two Dimensions
[Free Registration/Login may be required to access all resource tools.] Position vectors and identifying midpoints in 2 dimensions
Khan Academy
Khan Academy: Least Common Multiple
Find the lcm (least common multiple) of pairs of integers. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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