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Flippo
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Flippo is the game which starts with 4 numbers out of 1 to 10 and the operations +, -, x and :. Try to combine the 4 numbers and 3 operations such that the result is 24. If the numbers are 1, 6, 7, 10 then it is easy to find the result: (1 + 6 + 7 + 10), but for the set of numbers 5, 5, 9, 10 it is much more complicated!
Download the last version (v2.1) of the Flippo game!!
Flippo 2.1 (159k)
There is another version which has an extra function to find all solutions for an arbitrary set of numbers. This version can't be find on this site, but can be ordered by sending an email to me, in which you explain the reason why you like to use that version. Don't forget your name and the address of the school you are working for.
24 = 5 x 6 - 5 - 1
24 = 5 x (5 + 1) - 6

Find here a nice 24-game puzzle!

Last update: may 4, 2004
Dutch