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

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

Introduces and explains the concept of independent and dependent variables and their applications in real-world problems.

Introduces students to linear inequalities.

Students investigate linear functions with positive slopes by trying to guess the slope and intercept from inputs and outputs. Positive Linear Function Machine is one of the Interactivate assessment explorers.