Book excerpt: These lectures are based on the MATHCOUNTS Curriculum: • Algebra• Charts, Graphs & Tables• Computation• Consumer Math• Equations & Inequalities• Equivalent Expressions• Estimation & Approximation• Geometry• Logic• Measurement• Number Theory• Probability• Statistics Mathcounts problems follow the Common Core State Standards (CCSS) for mathematics that have been adopted by 44 states. Each lecture includes (1) Basic skills with examples, and (2) Exercises with answer keys.