Our search has the following Google-type functionality:

If you use '+' at the start of a word, that word will be present in the search results.

*eg. Harry +Potter*

*Search results will contain 'Potter'.*

If you use '-' at the start of a word, that word will be absent in the search results.

*eg. Harry -Potter*

*Search results will not contain 'Potter'.*

If you use 'AND' between 2 words, then both those words will be present in the search results.

*eg. Harry AND Potter*

*Search results will contain both 'Harry' and 'Potter'.*

NOTE: AND will only work with single words not phrases.

If you use 'OR' between 2 single words, then either or both of those words will be present in the search results.

*eg. 'Harry OR Potter'*

*Search results will contain just 'Harry', or just 'Potter', or both 'Harry' and 'Potter'.*

NOTE: OR will only work with single words not phrases.

If you use 'NOT' before a word, that word will be absent in the search results. (This is the same as using the minus symbol).

*eg. 'Harry NOT Potter'*

*Search results will not contain 'Potter'.*

NOTE: NOT will only work with single words not phrases.

If you use double quotation marks around words, those words will be present in that order.

*eg. "Harry Potter"*

*Search results will contain 'Harry Potter', but not 'Potter Harry'.*

NOTE: "" cannot be combined with AND, OR & NOT searches.

If you use '*' in a word, it performs a wildcard search, as it signifies any number of characters. (Searches cannot start with a wildcard).

*eg. 'Pot*er'*

*Search results will contain words starting with 'Pot' and ending in 'er', such as 'Potter'.*

This book promises to help teachers and all readers do just that by revealing some wonders of mathematics often missing from classrooms. Here's your chance to catch up with the math gems you may have missed in your school years.

Using jargon-free language and many illustrations, these veteran math educators explore five areas: arithmetic, algebra, geometry, probability and the ways in which mathematics can reinforce common sense. Among other things, you'll learn the rule of 72, which enables you to quickly determine how long it will take your bank account to double its value at a specific interest rate. Other handy techniques include an automatic algorithm for multiplying numbers mentally and a clever application that will allow you to convert from miles to kilometres (or the reverse) mentally.

A delightful presentation of geometric novelties reveals relationships that could have made your study of geometry more fun and enlightening. In the area of probability there is a host of interesting examples – from the famous Monty-Hall problem to the counterintuitive probability of two people having the same birthday in a crowded room.

Finally, the authors demonstrate how math will make you a better thinker by improving your organising abilities and providing useful and surprising solutions to common mathematics problems. You'll come away with a grasp of math you never thought possible and a true appreciation for this queen of the sciences.

Alfred S. Posamentier has published over sixty books in the area of mathematics and mathematics education, including, most recently, The Circle: A Mathematical Exploration beyond the Line (with Robert Geretschlager). After having been on the faculty of the City College of the City University of New York for forty years, where he was a professor of mathematics education and dean of the School of Education, he subsequently held the same positions at Mercy College, New York, for five years. He is currently Chief Liaison for International Academic Affairs at Long Island University. Robert Geretschlager is a mathematics teacher at Bundesrealgymnasium Keplerstrasse in Graz, Austria. He is the coauthor of The Circle (with Alfred S. Posamentier), Geometric Origami, and other works. Charles Li is an Assistant Professor of Mathematics at Mercy College. He earned his Ph.D. in Mathematics from the CUNY Graduate Center, and his B.Eng. in Electrical Engineering from Cooper Union. Christian Spreitzer teaches mathematics and physics at the University College of Teacher Education in Lower Austria.

PRAISE FOR THE WORK OF ALFRED S. POSAMENTIER: [A] joyously nerdy celebration of the history of geometry and trigonometry, exploring the dozens and dozens of curiosities sitting just beneath the surface of a seemingly ordinary triangle. --<i>Sacramento/San Francisco Book Review</i> (reviewing <i>Secrets of Triangles</i>) [Y]et another fine collection of mathematical insights, intriguing relationships, and surprising results focused on the triangle.... [A]n incredibly rich compendium of results that will lead the reader to consistently react in surprise about and appreciation of the richness and unexpected depth of triangular relationships.... [T]he illustrations are excellent. Highly Recommended. --<i>Choice</i> (reviewing <i>The Secrets of Triangles</i>) This volume could be useful to a teacher of mathematics as a source of examples that can hammer home important concepts. --<i>Library Journal</i> (reviewing <i>Magnificent Mistakes in Mathematics</i>)