Mathematics 10 - Foundations and Pre-calculus (2010). Mathematics 10 - Workplace and Apprenticeship (2010). Mathematics 20 - Foundations (2010). Mathematics 20 - Pre-calculus 20 (2010). Mathematics 20 - Workplace and Apprenticeship (2010). Mathematics 30 – Foundations (2012). Mathematics 30 – Pre-calculus (2012). Mathematics 30 - Workplace and Apprenticeship (2012). Calculus 30 (2012). Dorothy must solve an array of brainteasers in order to escape the clutches of her abductors, a group of mathematically obsessed aliens. Each short chapter is a mathematical adventure in which Dorothy is presented with a mystery, a puzzle, or a problem to solve. The author rates the problems in terms of difficulty.