Free Sample Lessons


Algebra 2


How Fraction Exponents Work

A simple explanation of why fraction exponents are the same as square roots. Copyright © 2016 by Michael Litzky

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The Zero Power

Another sample lesson: why is something to the zero power equal to one? Copyright © 2016 by Michael Litzky

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Pre-Calculus


Summing An Arithmetic Series

This lesson is for students studying sequences and series. It explains the formula for summing an arithmetic series. It also tells an interesting story about how a ten-year-old boy figured out the formula. Behold: a mathematical proof made interesting and easy to follow! Copyright © 2011 by Michael Litzky

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Proving Basic Trig Identities

Some strategies for proving trigonometric identities. Copyright © 2012 by Michael Litzky

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Algebra 1


Saved by a Word Problem -- It Really Happens!

A lively and amusing example of using "guess and check" to write an equation to solve a word problem which got me out of a jam. Just like we teachers always tell you might happen someday: this really happened to me! Copyright © 2011 by Michael Litzky.

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