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Polyup

polyup

https://www.polyup.com/

A free and open computational thinking playground. Modify expressions, functions, and algorithms to discover the beauty of math. Awesome for grades 1 through 12.


Prodigy

prodigy

https://www.prodigygame.com/

An engaging and adaptive way for students to practice mathematics in Grades 1 through 8. Has some great reporting tools. Completely free.