This is a subtraction game you can use with tokens, foam pieces, beans, or what have you. Two children play. Start with 5-10 beans on the table. One child looks away while the other puts a number on a strafoam cup with a cave print on it. Then the child turns back and writes how many started out, how many were left, then how many must be in the cave! They will have fun being sneaky and this will keep track of their learning and thinking.