Title: Nine-bead all function abacus
Application Number: 200520030432 Application Date: 2005.04.05
Publication Number: 000000000 Publication Date:
Approval Pub. Date: 2006.05.24 Granted Pub. Date: 2006.05.24
International Classifi-cation: G06C1/00
Applicant(s) Name: Li Zhigang Address:
Inventor(s) Name: Li Zhigang
Attorney & Agent: zhang zhihe
Abstract:
    The utility model provides an abacus which is easy to learn and convenient for numeral concept formation and numeral decomposition and composition. There is a primary rectangular frame; the upper frame and lower frame equidistantly scarf-joints several shift rods. And each shift rod is equipped with nine rhombus beads. The central bead of each shift rod, the upper four beads and the lower four beads have three obvious different colors. The upper surface of the frame is provided with position value marking. There are 10 - 20 shift rods equipped in the frame. And the beads can also be drum-shaped. It is easy to learn and has visual pattern; the beads and the number are uniform and combined. The two hands can do operation together, which promotes balanced development of a child left-right brain and effectively cultivates attention, memory, observation, imagination and thinking of the child. It is convenient for mental calculation and easy for memory and master; it is especially suitable for an infant to know numeral concept formation and numeral decomposition and composition; and it is a good tool for intellectual development of the child. The abacus can be extensively suitable for primary and middle school students and adults to do addition-subtraction-multiplication-division four-arithmetic operation.
Time: 14