MATHCOUNTS Mini #21 - Counting Rectangles in a Grid/Squares in a Lattice Grid

MATHCOUNTS Mini #20 - Using the Difference of Squares to Solve Problems

MATHCOUNTS Mini #50 - Counting Possibilities

Mini #52 - Geometry: More Circles and Right Triangles

MATHCOUNTS Mini #23 - Perfect Squares/Using a Simpler Case to Solve a Problem

Think Fast, Talk Smart: Communication Techniques

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Lecture 1: Introduction to Superposition

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MATHCOUNTS Mini #30 - Similar Triangles and Proportional Reasoning

Pre-Algebra Final Exam Review

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Paths Across a Grid (Permutations & Combinations)

MATHCOUNTS Mini #26 - Probability and Counting

MATHCOUNTS Mini #44 - Recognizing Squares and Solving a Simpler Problem.

MATHCOUNTS Mini #90 - Even More Analytic Geometry

Algebra Basics: What Is Algebra? - Math Antics

MATHCOUNTS Mini #16 - Relationships Between a Box's Dimensions, Volume and Surface Area