Find missing variables in division expressions quiz. This is an online math test on algebra in which students will solve problems involving a missing variable and the main operation being division. Typically, equations take the following form: 5 ÷ y = 1, what is the value of y ? Finding the value of ‘y’ will require that you balance the equation on both sides. Doing so means finding the value of the missing number, in this case y; another way of doing it is dividing both signs by ‘y’ and eliminating ‘y’ from one side of the equation. Once you learn how to solve these problems, head over to the algebra section and download a printable version for more offline practice. This algebra exercise is for students in 3rd, 4th, 5th and 6th grade.