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MATHCOUNTS Links

MATHCOUNTS
https://www.mathcounts.org/

Math by Design
http://mathbydesign.thinkport.org/

MATHCOUNTS Trainer
https://artofproblemsolving.com/mathcounts_trainer

Desmos Calculator
https://www.desmos.com/calculator 

Modular Arithmetic
https://www.khanacademy.org/computing/computer-science/cryptography/modarithmetic/a/what-is-modular-arithmetic

PARCC Practice Tests
https://parcc.pearson.com/practice-tests/math/