Binary Numbers --- Introduction --- Addition --- Multiplication --- Counter --- Card game - 1 - 2 - 3

You can use these cards to (apparently) guess a number that someone is thinking. First try the game to see what it looks like.While it looks impressive, it relies on simple Mathematics. This is how you play the game. Ask someone to think of a number. They should find all the cards with that number on, and give them to you. All you need do is add up the top left hand number on each of these cards. This will be the number they chose.

To watch this, enter a number between 1-60 and click on 'High-light cards'.

Now have a go yourself.© Jo Edkins 2006 - Return to Numbers index