Interactive Calculus: Quick Math!

GAME INFO
Interactive calculus game Quick Math! to play online, an interactive mathematical mental arithmetic activity in which simple addition and subtraction operations appear and you must click on the correct one. Each time the difficulty increases, more operations increase to compare whether they are true or false. Negative numbers may appear in some levels, adding to the complexity of the addition and subtraction operations in this Quick Math game. Time is limited to solve the operations. What is your mental arithmetic record with negative numbers?