5th grade pre algebra addition equations with variables Scientist quiz game - Interactive online game on pre-algebra - involves finding missing or unknown numbers/ variables in a linear equation. There are several linear equations containing different operations e.g. addition, subtraction, division or multiplication. Each operation makes the approach for finding the unknown unique. Hence students need to understand how to find unknowns in different situations to be able to successfully answer all the questions in this game. The activity is a interactive online math quiz with MCQ�s. As students find the missing variable, they will select the correct answer among the set of choices and submit. In the end they will see for themselves how much mastery they have of pre-algebra. This math activity is for children in 4th, 5th and 6th grade.