I just got a new chapter for the high-school textbook for which I’m writing mathematics problems. This chapter includes the following lessons: Fundamental Theorem of Counting, Compound Events, Permutations, and Combinations. Also, in addition to writing the problems for the high-school textbook, I’ve also been writing lessons for a middle-school standardized-test-prep book. The lessons I’ve written for that so far include topics such as differentiating between rational and irrational numbers, calculating the percentage of increases and decreases of a quantity, solving problems that involve discounts, markups, commissions, profit, and simple and compound interest, and computing the minimum, lower quartile, median, upper quartile, and maximum of a data set.

Tags: Math, Mathematics