Help students make connections in math with these colorful, engaging manipulatives. Plastic rods snap together to clarify addition, subtraction, multiplication, division, fractions, decimals, geometry, measurement, patterns, algebra and probability concepts in a visual and tactile way. Connecting feature makes manipulation and demonstration easier. Rods are marked in 1 - cm increments on one side. Economical Multi - Pack contains six sets of 74 durable rods for use with 12 - 18 students, Teacher's Guide and six convenient storage trays with lids.