Khan Academy Static

Topic F includes lessons 18-22 and covers writing and evaluating expressions—addition and subtraction, substituting to evaluate addition and subtraction expressions, writing and evaluating expressions—multiplication and division, writing and evaluating expressions—multiplication and addition, and writing and evaluating expressions—exponents.

9120_Evaluating_expressions_with_variables_cubes.html

9118_Evaluating_an_expression_with_one_variable.html

9119_Evaluating_expressions_with_variables_temperature.html

9121_Evaluating_expressions_with_variables_exponents.html

9123_Evaluating_expressions_with_two_variables_fractions_decimals.html

9122_Evaluating_expressions_with_two_variables.html