Math54--average 5th grade, advanced 4th by Saxon This kit contains all necessary materials for one student and one teacher for a full school year. Components are available separately for replacement purposes. Kit includes a textbook and an Incremental Development ( answer booklet included) The hardcover textbook includes incremental lessons. Starts with a review of addition, to place value, review of subtraction number lines, adding three digit numbers, reading scales, money, division, perimeter, multipication There are 141 lessons in this textbook. This is part of the home study kit Math 54, which is the first set for grades 4-8. SAXON MATH: Math is the mother of science. It is very important to build a solid foundation for math. After we tried different math books to homeschool our children, we like Saxon Math best and Saxon Math is indeed very popular among homeschooling families. They use "incremental" approach, i.e. introduce concepts in small pieces and then continually review that concept as they add more pieces. Topics are never dropped; instead, they are gradually increased in complexity, allowing it to become second nature. Just a small investment but give your children a strong start in Math. It is a very worthy investment . The new copy costs about $58.00.