AoPS Pre-Algebra

Lessons

Module 1: Properties of Arithmetic, Exponents, and Number Theory

Module 2: Fractions, Equations and Inequalities, Decimals, and Ratios, Conversions, and Rates

Module 3: Percents, Square Roots, and Angles

Module 4: Perimeter and Area, Right Triangles and Quadrilaterals, and Data and Statistics

Module 5: Counting and Problem-Solving Strategies