Bump your way to fluency with addition and subtraction math facts! Players become fluent in addition facts (9+9) and subtraction facts (18-9) by solving mental math problems in this fun, colorful easy to learn format. Spin the spinner, answer correctly and claim the space with your disk car or bump your opponents off theirs to gain an advantage. There are two ways to play with addition or subtraction games. Game-time is adaptable to your classroom needs. 2-4 players.