Evaluate Expressions with given values quiz. This is an interactive online math quiz which introduced students to basic algebra skills. In this exercise students are asked to evaluate an equation when a variable has a given value for example, evaluate the expression 4 + y = when y = 5. If the value of ‘y’ is substituted in the equation, the value will be as follows: 4 + 5 = 9. There are activities of similar nature in this exercise. From 3rd grade students will start to familiarize themselves with basic algebra skills which will be further seen in later grades. After solving each problem, hit the submit button to find out how you performed. This variables and expressions exercise is for students in 3rd, 4th, 5th and 6th grade.