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Procedure Solver

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

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Adding Machine

Can you set the logic gates so that this machine can decide how many bulbs have been switched on?

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Not Another NAND!

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

Circular Circuitry

Stage: 5 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3

Think of a circuit as a flow of electrons. As a switch is flipped on, electrons flow from the switch. What happens when they reach a gate? Trace the path of the current around the circuit.

This problem involves the sort of thinking typically found formally in Decision Mathematics modules, but can be attempted armed only with a basic understanding of logic and truth tables.