The Green Collection (grades 6-12) is accessible to many middle school students while still challenging enough for high school students. It introduces classic problems like the four-color map, the division of irregular areas into equal parts, magic squares, and number mazes. (Education/Teaching)

Green Collection The Green Collection (Grades 6-12) is accessible to many middle school students while still challenging enough for high school students. It introduces classic problems like the four-color map, the division of irregular areas into equal parts, and magic squares and number mazes.