Other
Math Portal: Arithmetic Progressions
A mini-lesson on arithmetic progressions includes a definition, examples with solutions, and a set of interactive problems at the completion of each lesson.
Harvey Mudd College
Mudd Math Fun Facts: Magic Squares, Indeed!
This tutorial provides a definition and examples of a "magic square" and then shows a proof and generalizations.
Harvey Mudd College
Mudd Math Fun Facts: Difference of Squares
Using algebra, learn how to do fast math in your head!
Harvey Mudd College
Mudd Math Fun Facts: Squares Ending in 5
This math tutorial features an exercise in which you are given any two-digit number that ends in 5 and then square it in your head.
National Council of Teachers of Mathematics
The Math Forum: Algebra Problem of the Week
This Math Forum resource poses a weekly problem to students. If desired, students may submit their answers. Solutions are published the next week.
United Nations
Unesco: Algebra Review (In Arabic)
This page, part of a larger UNESCO site on math and science education, has 15 basic, open- and multiple-choice algebra questions, with the correct answer immediately following the question. Entirely in Arabic.