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Encode and decode messages to determine the form for an affine cipher. Input a message to encode, then input your guesses for the constant and multiplier. Caesar Cipher II is one of the Interactivate assessment explorers.

Sierpinski's Triangle (Activity)

Step through the generation of Sierpinski's Triangle -- a fractal made from subdividing a triangle into four smaller triangles and cutting the middle one out. Explore number patterns in sequences and geometric properties of fractals.

Dimension for Irregular Fractals (Discussion)

Discusses the problem of determining the fractal dimension of irregular fractals and how the scale is indeterminite in these fractals.

Cryptography and Ciphers (Discussion)

Introduces the notion of using modular arithmetic to encode messages.

Estimator Quiz (Activity)

Test your estimation skills by answering questions. This quiz asks you to estimate the answer to addition, multiplication, and percentage questions. Choose difficulty level, question types, and time. Estimator Quiz is one of the Interactivate assessment quizzes.

Recursion (Discussion)

Discusses the idea of recursion as it pertains to fractals and sequences.

Algorithm Discovery with Venn Diagrams (Lesson)

Students discover algorithms as they sort shapes into Venn diagrams. Then students compare the efficiency of their algorithms using box plots.

Exponents and Logarithms (Discussion)

Gives an introduction to the concept of a logarithms and shows how logs can be used to calculate fractal dimension.

Worksheet for Sets and the Venn Diagram Beginner

This worksheet is for use with the lesson Sets and the Venn Diagram Beginner (http://www.shodor.org/interactivate/lessons/SetsTheVennDiagramBeginner/).

Venn Diagram Algorithm Worksheet (doc)

This worksheet is for use with the lesson Algorithm Discovery with Venn Diagrams (http://www.shodor.org/interactivate/lessons/AlgorithmDiscovery/).

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