A hilarious reeducation in mathematics-full of joy, jokes, and stick figures-that sheds light on the countless practical and wonderful ways that math structures and shapes our world. In Math With Bad Drawings, Ben Orlin reveals to us what math actually is; its myriad uses, its strange symbols, and the wild leaps of logic and faith that define the usually impenetrable work of the mathematician. Truth and knowledge come in multiple forms: colorful drawings, encouraging jokes, and the stories and insights of an empathetic teacher who believes that math should belong to everyone. Orlin shows us how to think like a mathematician by teaching us a brand-new game of tic-tac-toe, how to understand an economic crises by rolling a pair of dice, and the mathematical headache that ensues when attempting to build a spherical Death Star. Every discussion in the book is illustrated with Orlin's trademark "bad drawings," which convey his message and insights with perfect pitch and clarity. With 24 chapters covering topics from the electoral college to human genetics to the reasons not to trust statistics, Math with Bad Drawings is a life-changing book for the math-estranged and math-enamored alike.

Calculator Mathematics for the Real Estate Professional has two objectives: 1) to show you how to correctly answer the mathematics questions on a real estate licensing examination for salespersons or brokers; 2) to be a time-saving reference for real estate professionals, investors, tenants, accountants, lenders, and attorneys. Even those who are capable of performing complex mathematical computations will welcome the practicality of having the formulas and methods contained in one easy-to-use reference and will benefit from the short-cut, time-saving techniques described, including—how to determine in seconds (without handbooks or tables) the monthly payment on a mortgage loan, the outstanding loan balance at any particular point in time, or the interest portion of mortgage payments for a given year. The first ten chapters explain the various computations one will encounter in licensing examinations and everyday practice. The last three chapters describe how to use a pocket calculator to quickly solve these computations, and provide the method of solving more complex and advanced problems such as: computation of the area of unusually shaped land areas and the various calculations related to ‘balloon" mortgages. Examples are given for an algebraic language calculator and a reverse Polish calculator as well as for a basic four function model. Real estate practitioners who master the time-saving skills explained will increase their productivity, listings, commissions, and professionalism.

Our physical world is embedded in a geometric environment. Plane geometry has many amazing wonders beyond those that are briefly touched on in school curriculums. The triangle, one of the basic instruments in geometry, has a plethora of unexpected curiosities. Geometric Gems presents one of the largest collections of triangle curiosities currently available, which the authors discuss in an easily understood fashion, requiring nothing more of readers other than the very basics of school geometry to appreciate these curiosities and their justifications or proofs.The book is intended to be widely appreciated by a general audience, and their love for geometry should be greatly enhanced through exploring these many unexpected relationships in geometry. Geometric Gems is also suitable for mathematics teachers, to enhance the education of their students with these highly motivating triangle properties.