XP Math has a collection of interactive games for many types of math skills for students in grades 5-9. They are based on common core state standards and range from numbers and operations, to algebra, geometry, measurement, and data analysis…
This Basics of Algebra Exponent Workout is an interactive where kids practice using exponents in algebraic form. If they have difficulty, there is an “In Depth” link where students can reviews the rules of calculating exponents.
From site: Algebra 2/Trigonometry Resources are a collection of free resources for students studying and/or reviewing a second course in high school algebra and/or trigonometry.