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Links

Bletchley Park

• www.cimt.plymouth.ac.uk

Some more code resources.

• www.nrich.maths.org.uk

Classwork

Spring 2009

We started from :The Secret World of Codes and Code Breaking

• here

and Ancient Runes

• here

We then switched to EAN Bar codes :

• here

Clock Arithmetic Exploration Questions

Activity :

• here

EAN Bar codes : some work around the left hand guard numbers.

• here