![]() The multi-abacus of claim 9 wherein the first zone beads are position ed to perform base two calculations.ġ4. The multi-abacus of claim 9 wherein the third zone beads of a first color and the other third zone beads are of contrasting colors.ġ3. ![]() The multi-base abacus of claim 9 wherein the second zone bead nearer the first divider and the other second zone bead are of contrasting colors.ġ2. The multi-abacus of claim 9 wherein the first zone bead, the second zone bead of a first color and the third zone bead of a first color are the same color.ġ1. A multi-abacus useful for performing calculations in a number base selected from multiple number bases, the multi-abacus consisting essentially of: a) a frame b) a plurality of rods positioned parallel to each other across the frame c) one first zone bead positioned on each of at least a major portion of the rods in a first zone formed by the frame and a first divider d) two second zone beads positioned on each of at least a major portion of the rods in a second zone formed by the frame, the first divider and a second divider, the second zone beads being of different colors with the second zone beads of a first color being positioned nearer the first divider than the second zone beads of a second color and, e) five third zone beads positioned on each of at least a major portion of the rods in a third zone formed by the frame and the second divider, the third zone beads comprising one third zone bead of a first color and four beads of a second color, the third zone bead of the first color being located farthest from the second divider wherein the beads are colored and positioned so that the beads used with a particular number base can be readily identified.ġ0. The multi-abacus of claim 1 wherein the first zone beads, the two second zone beads and the four third zone beads nearest the second divider are positioned for use to perform base sixteen calculations.ĩ. The multi-abacus of claim 1 wherein the second zone beads nearest the second divider and the four third zone beads nearest the second divider are positioned for use to perform base eight calculations.Ĩ. The multi-abacus of claim 1 wherein the first zone beads and the two second zone beads are positioned for use to perform base four calculations.ħ. The multi-abacus of claim 1 wherein the first zone beads are positioned to perform base two calculations.Ħ. The multi-abacus of claim 1 wherein the third zone bead of a first color and the other third zone beads are of contrasting colors.ĥ. The multi-base abacus of claim 1 wherein the second zone bead nearer the first divider and the other second zone bead are of contrasting colors.Ĥ. The multi-abacus of claim 1 wherein the first zone bead, the second zone bead of a first color and the third zone bead of a first color are the same color.ģ. ![]() A multi-abacus useful for performing calculations in a number base selected from multiple number bases, the multi-abacus comprising: a) a frame b) a plurality of rods positioned parallel to each other across the frame c) a first zone bead positioned on each of at least a major portion of the rods in a first zone formed by the frame and a first divider d) two second zone beads positioned on each of at least a major portion of the rods in a second zone formed by the frame, the first divider and a second divider, the second zone beads being of different colors with the second zone beads of a first color being positioned nearer the first divider than the second zone beads of a second color and, e) five third zone beads positioned on each of at least a major portion of the rods in a third zone formed by the frame and the second divider, the third zone beads comprising one third zone bead of a first color and four beads of a second color, the third zone bead of the first color being located farthest from the second divider wherein the beads are colored and positioned so that the beads used with a particular number base can be readily identified.Ģ. Having thus described the invention, I claim:ġ. Teaching apparatus and method for solving algebraic linear equationsĬombined desktop abacus and electronic calculator Teaching apparatus and method for visually representing mathematical expressionsĮlastic pattern abacus and tool for changing arrangement of abacus beadsĬombined electronic calculator and abacus with deflective guide bars Apparatus and method for scoring dart games ![]()
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