On the bench · not built yet

Carnival Odds

Spin wheels and roll dice thousands of times; compare theoretical odds to the experiment. Are the carnival games fair?

Nearby on the shelf

Run a diner register: tips, tax and discounts. Spot the constant of proportionality in every receipt.

Add hot air (positives) and sandbags (negatives) to a balloon; removing a sandbag goes up. Signed rules...

Memory-style card game: match expressions that are equivalent but written differently.