Three-number straight-adding and straight-subtracting abacus with three beads on each upper
An abacus and abacus technology, applied in the field of teaching aids, can solve the problems of not encouraging students to learn mathematics, complex learning, and difficulty in understanding, and achieve the effect of easy learning and mastery.
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[0067] Example 1
[0068] Such as figure 1 Shown: The upper three-type three-number direct addition and direct subtraction abacus is an improvement on the traditional abacus. The upper two upper beads of the traditional "up two under five" type abacus are turned into three upper beads (3), below Five lower beads become twelve lower beads (7), which is an abacus of "up three and lower twelve". One upper bead (3) represents 5, and one lower bead (7) represents 1. The middle four of the twelve lower beads (7) in each grade are in different colors from the upper four and the lower four; a digital card (6) is set on the frame (1); the abacus beads of each grade use different colors Represents different bits.
Example Embodiment
[0069] Example 2
[0070] Such as figure 2 Shown: The upper three-type three-number direct addition and direct subtraction abacus is to turn the twelve lower beads of the "up three lower twelve" type abacus into thirteen lower beads (7), which is "up three lower thirteen" In the abacus, the upper bead (3) represents 5, and the lower bead (7) represents 1. The middle four of the thirteen lower beads (7) in each gear are in different colors from the upper four and the lower five; a digital card (6) is set on the frame (1); the abacus beads of each grade use different colors Represents different bits.
Example Embodiment
[0071] Example 3
[0072] Such as image 3 Shown: The upper three-type three-number direct addition and direct subtraction abacus is to turn the twelve lower beads of the "up three lower twelve" type abacus into fourteen lower beads (7), which is "up three under fourteen" In the abacus, the upper bead (3) represents 5, and the lower bead (7) represents 1. The fifth and tenth of the fourteen beads (7) in each grade are heterochromatic beads (5); a digital sign (6) is set on the frame (1); the beads of each grade are represented by different colors Different bits.
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