Waterloo Mathematics
Grade 7 Patterning and Algebra: Algebraic Expressions
Classmates solve 18 different problems that are mostly word problems that apply algebraic expressions. They draw different combinations of masses on a scale that would balance. They also simplify expressions and solve for x in a number...
National Council of Teachers of Mathematics
The Math Forum: Equivalent Expressions and Equations
Dr. Math at the Math Forum explains the difference between equivalent expressions and equivalent equations.