Negative Numbers : Directed Numbers, Paperback by Watchman, Robert, ISBN 1503361047, ISBN-13 9781503361041, Brand New, Free shipping in the US We are all well aware of the concept of being in debt or of being in the red. We even understand that temperatures go below zero. But when it comes to mathematics, working with negative numbers seems to become like a foreign numbers is a concept that comes up in virtually every area of mathematics. Trying to avoid this is near impossible. Trying to answer questions in mathematics also becomes difficult without a sound knowledge of negative the easy steps set out in this book, working with negative numbers becomes a breeze and as a result so does algebra, trigonometry, linear equations and all the other topics that require this knowledge.