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Khan Academy
Khan Academy: Properties of Exponents Challenge (Integer Exponents)
A quiz that covers all exponent properties using integer exponents.
University of Utah
University of Utah: An Example of Logical Construction: Powers
A page which uses exponents as a step-by-step example of how logic is used to find complex mathematical concepts by building upon simpler concepts.
Khan Academy
Khan Academy: Evaluate Radical Expressions Challenge
Evaluate numerical radical expressions using the properties of exponents.