Improve your mental math skills with this comprehensive guide to arithmetic. James Ferguson covers addition, subtraction, multiplication, and division using a variety of techniques. With practice problems and detailed explanations, readers will gain the skills and confidence needed to solve complex math problems in their heads. This book is an essential resource for students and anyone looking to improve their math skills. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.