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www.purplemath.com/

Practical math help provided by informal lessons. Get help with your math concept questions, and learn how to succeed!

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Pre-algebra and algebra lessons, from negative numbers through pre-calculus.

www.purplemath.com/modules/ordering.htm

Grouped by level of study. Lessons are practical in nature informal in ... Variables · Exponents: Basic Rules · Order of ...

www.purplemath.com/about.htm

About Purplemath. Elizabeth Stapel: The primary developer of Purplemath and ...

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Lessons and Tutoring - Reviews. The reviews below refer to free (or free-to-try) ...

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Links to web sites offering quizzes and worksheets; reviewed by Purplemath.

www.purplemath.com/modules/orderops.htm

A common technique for remembering the order of operations is the ...

www.purplemath.com/modules/solvelin.htm

"Linear" equations are equations with just a plain old variable like "x", rather ...

www.purplemath.com/modules/exponent.htm

Covers the basic exponent rules, explaining ... Exponents are shorthand for ...

www.purplemath.com/modules/meanmode.htm

Explains how to compute the mean, median, mode, and range of a list of ...