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    Khan Academy:  a set of online tools that help educate students. The organization produces short lessons in the form of videos https://www.khanacademy.org/
    Xtra Math: an online math fact fluency program that helps students develop quick recall and automaticity of their basic math facts. https://home.xtramath.org/
    Legends of Learning: Over 2,000 fun, curriculum-aligned, math and science games created to engage students.