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This worksheet is for use with the Recursion activity (http://www.shodor.org/interactivate/activities/Recursion/).

Introduces students to modular (clock) arithmetic and how modular arithmetic can be used to encode messages using simple shift, multiple and affine ciphers.

Create your own fractals by drawing a "line deformation rule" and stepping through the generation of a geometric fractal. Parameters: Grid type, number of bending points on the line.

Introduces students to estimation.

Students learn to identify a variety of patterns using sequences and tessellations.