Pre-algebra.

This online course allows students to review certain calculus concepts: divisors, multiples, sequences, ratios, rates, percentages, exponents, order of operations, variables, expressions, equations, inequalities, rational numbers, proportional relationships, roots, scientific notation, first-degree equations with two unknowns, affine functions, and systems of equations. The concepts are presented in the form of videos and short review exercises with immediate feedback. A final challenge completes the course.