3rd grade subtraction find missing numbers Monster board game - This is a fun math game with a start and stop button. Once you hit the start button, you release the monster on this board game. It also enables you to start answering questions. Students will solve a math problem each time and earn points. The concept being introduced in this game is that of solving for unknown variables in algebraic expressions that will be studied later. Students have to solve a subtraction problem and balance the equation. In order to balance the equation students have to find the number that is missing from the other side of the equation to enable it have the same value as on the other side of the equation. Solving and balancing subtraction equations by finding missing numbers is a skilled learned by students in 3rd, 4th, and 5th grade. This monster board game will make the activity more exciting.