Math Mammoth Division 1 is a worktext that covers the concept of division, finding whole-number quotients within 0-100 (essentially, the basic division facts), and bar graphs and pictographs. It is most suitable for third grade, after the student knows the multiplication tables. I recommend the student know the multiplication tables fairly well before starting this book. In fact, the approach taken here to teach division facts is to simply base them on the multiplication tables, and not to teach them as a separate set of facts to memorize. This is very efficient, and works well when the student knows the times tables, but is nearly useless for someone who doesn't know them. Several lessons in the book focus on this basic concept that division problems can be solved by thinking of multiplication. This book will be relatively easy for students who have mastered the multiplication tables, since division facts are just multiplication tables “backwards”. So, students can focus on another important skill: recognizing real life situations in word problems that mathematically relate to either division or multiplication. This is very important to master so that the student can later on translate more complex situations into equations (modeling with mathematics). In this book, students will find quotients (answers to division problems) by thinking of the multiplication tables. In continuation (in 4th and 5th grades), they will divide larger numbers, primarily using long division, though thinking of multiplication will still be used for some types of division problems. The basic concept of division is also the foundation for finding factors of a number and prime factorization, which are typically studied in 4th and 5th grades. You can find free videos covering topics of this book at https://www.mathmammoth.com/videos/ (choose 3rd grade, then division). The answer key is appended.