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

Learn about estimation through modeling of a forest fire. This activity allows the user to burn a virtual forest, then estimate the number, the percent, or the fraction of trees burned. Fire Assessment is one of the Interactivate assessment explorers.

Introduces the notion of using modular arithmetic to encode messages.

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

The question of fairness in a game of two dice leads to the concept of divisibility.