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Prime Numbers & Public Key Cryptography
Description
For anyone else teaching Middle School, this is a great link for linking Prime Numbers and Cryptography.

I then usually play a simple (but very fun!) game:

> Show a 1-100 grid with prime numbers highlighted
> I (secretly) multiply two prime numbers, and tell the result
> Students have to figure out (using a calculator) which numbers I multiplied
> They then try this on each other

It really gets them using the prime numbers, and introduces the idea of the "lock" (easy to lock, very hard to open).
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