Algebraic Expressions & Equations

Expressions and Equations

Formative Assessment

Summary of the Math: Expressions and Equations

Read and Discuss

An expression can combine arithmetic operations with numbers, letters, or both. Letters are used to represent variables.

  • To evaluate an expression, find the value of the expression by replacing each variable in the expression with a given number.
  • Two expressions are equivalent if they represent the same amount. When a given value is substituted for each variable (such as x), equivalent expressions have the same value.
  • An equation is a statement that two expressions are equal. Every equation is composed of two expressions linked by an equal sign.
  • To solve an equation, find the value of the variable that makes the two sides of the equation equal.


Can you:

  • Describe the differences between an expression and an equation?
  • Explain what it means to evaluate an expression?
  • Explain what it means to solve an equation?
  • Explain what it means for expressions to be equivalent?