This book provides a series of practical exercises designed to help students improve their mental arithmetic skills. The exercises cover a wide range of topics, from addition and subtraction to fractions and decimals, and are designed to be challenging and engaging. The book includes detailed explanations of each exercise, as well as helpful tips and strategies for success. This is an excellent resource for teachers, parents, and students who want to enhance their math skills and build their confidence. 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.