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Crossing the Bridge

Four friends must cross a bridge. How can they all cross it in just 17 minutes?

Procedure Solver

Can you think like a computer and work out what this flow diagram does?

Not Another NAND!

Prove that you can make any type of logic gate using just NAND gates.

The Jabber-notty

Age 16 to 18
Challenge Level

Lewis Carrol thought that (in Through the looking glass, and what Alice found there)

'Twas brillig, and the slithy toves Did gyre and gimble in the wabe'

I disagree entirely. Construct the negation of this sentence to represent my view.

Did you know... ?

Lewis Carrol was a mathematician who delighted in logical games and wordplay. His books are full of the sorts of sentences which often amuse those with a good understanding of logic. 
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.
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