Students start with zero in the bank, they flip a coin and roll a dice to see whether they should add or subtract a positive or negative amount. Deeper questions include, what is the max/min amount possible, what is the probability of achieving this etc.

Students have to combine sharing an amount in a %, fraction and/or ratio and also state the proportion left over.

Great intermediate/higher competition, students can choose whether to tackle the problem alone or confer with team mates as well as opting for their desired level of difficulty.

Students compare 2 products based on price per item or weight. Coca cola question creates great debate every time!