Abstract: The device disclosed in the present application is a compact and convenient mathematical manipulative that can be used to assist students who have varied modalities or learning styles (auditory, visual, tactile, vocal). The device essentially comprises two parallel, co-planar U-shaped “storage” and “operational” rods, with one prong of each U-shape connected to a support handle, and the remaining prong of each rod joined to each other via a short-segmented undulated horizontal segment. Each “operational” rod supports an even-numbered quantity of through-drilled beads which may be slidably positioned along the lengths of the storage and operational rods. The beads may be of a first color on one pair of rods and a second color on the opposite pair of rods and further, each rod is designated as either a negative (?) or (+) calculator.