This is a "Tomo" (Friend) textbook for arithmetic from Hamagakuen. It includes the first to third volumes. Answer keys and explanations are also included. Since it has been used, there are some writings and areas that have been erased with correction fluid, as I intended to copy them. I have included photos for your reference. I am selling it at a low price, so please refrain from purchasing if you are looking for a "like new" condition. I will sell it to those who understand that it is within a range that does not hinder solving the problems. The explanations in this textbook are very easy to understand, making it ideal for self-study. The answer keys and explanations are also very clear.