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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.

Mind Your Ps and Qs

Sort these mathematical propositions into a series of 8 correct statements.

Notty Logic

Age 16 to 18 Challenge Level:

Look at the variables in each statement which can either, individually, be true or false.

Then draw a truth table for the statements.

The NOT of the statement will be created by switching 1s to 0s, and vice versa, in the appropriate part of the truth table.


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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NRICH is part of the family of activities in the Millennium Mathematics Project.