Lower nine type direct adding and subtracting abacus
A technology of abacus and beads, applied in the field of teaching aids, can solve the problems of discouraging children from learning mathematics, suppressing children's thinking ability, negative teaching guidance, and difficulty in understanding, and achieves the effect of easy learning and mastering
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[0068] Example 1
[0069] Such as figure 1 Shown: The lower nine-type direct addition and direct subtraction abacus includes a frame (1), a gear lever (2), an upper bead (3), a lower bead (7) and a beam (4). There are 16 gear rods (2), which are arranged in the frame (1); the beam (4) of the present invention divides the abacus beads into "upper two lower nine" abacus beads structure, that is, the upper two abacus beads, the bottom Nine abacus beads, one upper bead (3) represents 5, and one lower bead (7) represents 1; the middle one of the nine lower beads (7) in each gear is a heterochromatic bead (5); on the frame (1) Set the digital card (6); the abacus beads of each file use different colors to indicate different positions.
Example Embodiment
[0070] Example 2
[0071] Such as figure 2 Shown: The lower nine-type direct addition and direct subtraction abacus includes a frame (1), a gear lever (2), an upper bead (3), a lower bead (7) and a beam (4). There are 16 gear rods (2), which are arranged in the frame (1); the beam (4) of the present invention divides the abacus beads into a "up, three, and a lower nine" abacus structure, that is, the upper three abacus beads, the lower Nine abacus beads, one upper bead (3) represents 5, and one lower bead (7) represents 1; the middle one of the nine lower beads (7) in each gear is a heterochromatic bead (5); on the frame (1) Set the digital card (6); the abacus beads of the first, second, and third grades use orange, the fourth, fifth, and sixth grades use red, the seventh, ninth, and ninth grades use green, that is, the three grades of abacus beads Use a color to represent different bits.
Example Embodiment
[0072] Example 3
[0073] Such as image 3 Shown: The lower nine-type direct addition and direct subtraction abacus includes a frame (1), a gear lever (2), an upper bead (3), a lower bead (7) and a beam (4). There are 16 gear rods (2), which are arranged in the frame (1); the beam (4) of the present invention divides the abacus beads into "upper four and lower nine" abacus beads structure, that is, the upper four abacus beads, the lower Nine abacus beads, one upper bead (3) represents 5, and one lower bead (7) represents 1; the middle one of the nine lower beads (7) in each gear is a heterochromatic bead (5); on the frame (1) Set the digital card (6); the abacus beads of each file use different colors to indicate different positions.
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