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Choose any three by three square of dates on a calendar page...

Card Trick 2

Can you explain how this card trick works?

The Patent Solution

A combination mechanism for a safe comprises thirty-two tumblers numbered from one to thirty-two in such a way that the numbers in each wheel total 132... Could you open the safe?

Do Unto Caesar

Age 11 to 14 Challenge Level:

This problem encourages students to think carefully about what the ratio actually means. The total sum of money doesn't change, so students need to convert the distribution given as a ratio into a fraction form to help them consider what each player has before and after the game.