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Lesson Plan
Shodor Education Foundation

Shodor Interactivate: Spy Game

For Teachers 9th - 10th
Students will learn about modular arithmetic in order to decipher encrypted messages.
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Interactive
Shodor Education Foundation

Shodor Interactivate: Caesar Cipher

For Students 9th - 10th
Create your own affine cipher for encoding and decoding messages. Input your own constant and multiplier, then input a message to encode.
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Unknown Type
Khan Academy

Khan Academy: Congruence Relation

For Students 9th - 10th
A quick comprehension check over congruence relation.

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