Each flashcard is assigned a random multiplier, for example ‘x2’, ‘+10’, ‘/3’, ‘-20’. A ‘high score’ is written on the board, which is the number to beat (this can be an arbitrary number, the previous class’s score, etc). Students repeat the teacher until the timer goes off, and whichever multiplier that is under the card that’s called last becomes the first part of the ‘maths line’ sum. This continues until there are no more rounds. The result of the sum is written down, and if it beats the ‘high score’, the class wins.