Texas A&M University
Wtamu Virtual Math Lab: Intermediate Algebra: Algebraic Expressions
Definitions, example problems, and practice exercises will help you evaluate and write algebraic expressions.
Khan Academy
Khan Academy: Evaluating Expressions With Variables Word Problems
Practice plugging in values to evaluate real-world algebraic expressions. These are introductory problems, so the expressions aren't too complicated. Students receive immediate feedback and have the opportunity to try questions...