["EDUCATION \/ Secondary","EDUCATION \/ Teaching Methods & Materials \/ Mathematics","JUVENILE NONFICTION \/ Mathematics \/ General","MATHEMATICS \/ Study & Teaching","Mathematics.","Mathematics;Study and teaching (Middle school);United States.","Mathematics;Study and teaching.","CHILDREN'S MATHEMATICS","EDUCATION \/ Secondary","EDUCATION \/ Teaching Methods & Materials \/ Mathematics","How-to\/Do-it-yourself","JUVENILE","JUVENILE NONFICTION \/ Mathematics \/ General","Juvenile Grades 4-6 Ages 9-11","Juvenile Non-Fiction","MATHEMATICS \/ Study & Teaching","Mathematics.","Mathematics;Study and teaching (Middle school);United States.","Mathematics;Study and teaching.","Study and teaching","United States"]