MathCounts is a competitive math competition that helps with a number of skills, including arithmetic, algebra, geometry, number theory, and probability. The competition has different rounds, some helping with speed, and others focus on word problems.
You can learn more about MathCounts at https://www.mathcounts.org/
Visit the MathCounts playlist at https://www.youtube.com/watch?v=3gHklXBGs04&list=PLbhMrFqoXXwnZqHrx0EChrK2nv4KqyXT9
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