Wolfram Research
Wolfram Math World: World's Most Extensive Mathematics Resource
MathWorld provides a huge mathematics encyclopedia detailing the concepts of geometry, algebra, calculus, discrete math, number theory, and other math topics--complete with formulas, diagrams, examples, and references for thorough...
Other
Math Bugs Me: Add Subtract Integers
This website provides students tips on how to add integers using absolute value and by introducing them to a pattern.
Purple Math
Purplemath: "Number" Word Problems
Demonstrates, step-by-step and with illustrations, how to set up and solve 'number' problems.
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