Tier 1. The TI 30XA is an inexpensive, yet powerful, calculator. The lessons in Tier 1 teach your student how to get the most out of this calculator, covering topics ranging from basic operations (addition, subtraction, etc.) and storing numbers in memory to working with fractions and trigonometry operations (SIN, COS, TAN). Pre-Algebra is a great foundation for your student to create a solid future in mathematics. This course explains the basic rules for addition, multiplication, and the distributive law, as well as explaining fractions, squares, square roots, reciprocals, exponents, and other topics crucial to understanding higher level mathematics.