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Doina Popovici
Math Play: Exponents Jeopardy Game
A Jeopardy game where students solve a variety of math problems with powers and exponents. This game can be played alone or in teams.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: "N^0"
"Why is any number raised to the zero power equal to one?" A good question and an even better answer
Other
Brown Math: It's the Law the Laws of Exponents
Step-by-step explanations of the exponent laws including rules for combining powers and roots. Includes practice exercises.
National Council of Teachers of Mathematics
The Math Forum: Middle School Archive
This site from the Math Forum provides a list of links to many questions from the Dr. Math archive about exponents. This is a good site to use to direct you to different but associated information on the subject.