Enrichment units in math

A three-book set designed to facilitate the use of enrichment and individual activities for the classroom teacher of grades 2-7. Book 1 for grades 2-3 provides activities using attribute blocks, tangrams, sets and Venn diagrams, and ancient Egyptian numbers. Book 2 for grades 4-6 covers permutations and combinations, tessellations, line drawings, and coordinate graphing. Book 3 for grades 5-7 deals with topology, probability, number characteristics, and magic squares.