Cuisenaire® Rods give students visual confirmation of their hands-on investigations of math concepts. Rods come in various lengths that can be assigned different numeric values or units of measure. Rods measure 1 cm-10 cm in length. Each color represents a different Rod length that can be assigned a different numeric value or unit of measure. Helps students transition from concrete to abstract representation of math concepts. This classroom set is great for improving skills such as: Counting & Cardinality, Addition & Subtraction, Multiplication & Division, Fractions, Geometry & Measurement. Economical Multi-Pack of plastic rods contains: Six sets of 74 rods, Six trays with lid, Teacher's Guide. For use with 12—18 students. Grades PreK+ Recommended age 4+ years