Box type direct adding and subtracting number-display abacus

Abstract

The invention discloses a box type direct-adding and direct-subtracting display abacus, and the traditional abacus has a plurality of facts, and can not realize direct adding and direct subtracting, and is difficult to be combined with written calculations of the modern mathematics education. In order to solve the problems, the invention provides the abacus facilitating reading and computation, and the abacus comprises a bottom box, guide rails, upper beads, lower beads and a beam, a bottom box adopts a box type structure with a closed bottom, three to twenty guide rails are arranged in the bottom box in parallel, the guide rails are semicircular or square with bulges, and are as tall as the bottom box, and one bead is clamped in each guide rail for matching with the guide rail in shape; the beam divides the beads into a form of or , one of upper beads represents 5, and one of lower beads represents 1; and nine numbers of 1 to 9 are marked on lower bottom faces of the nine lower beads on each rod sequentially. The abacus has the advantages that numbers can be read when jerking beads and numbers alter following the movement of beads, and the abacus need no fact and can realize the direct adding and direct subtracting, and is easy for learning and understanding and enables people to better understand the concepts of carrying and backing.

Description

technical field [0001] The invention relates to a learning tool, in particular to an abacus suitable for reading and calculating. Background technique [0002] Abacus is a traditional Chinese calculation tool and an important invention in ancient China. The use of abacus and abacus is not only convenient for calculation, but also has the effect of exercising thinking ability. Using the abacus requires the close cooperation of the brain, eyes, and hands. Therefore, many schools and parents use the abacus to train children's thinking and calculation skills. Traditional abacus generally adopts the bead structure of "up two down five", "up two down four", "up down five" or "up down four". The calculation of this kind of abacus requires a separate set of formulas: [0003] Addition table [0004] Add one: one to one, one to five to four, one to nine to one; [0005] Add two: two to two, two to five to three, two to eight to one; [0006] Add three: three to three, three to f...

AI Technical Summary

Problems solved by technology

[0023] There are so many formulas, and there are 2 to 3 situations for each addition or subtraction of a number, it is more complicated to learn and difficult to understand

This set of formulas is only applicable to the traditional abacus, and cannot be used in other places. It is easy to forget after a long time. It can only be used on the premise of memorizing the formulas. During the calculation, follow the formulas to dial the beads. The problem is that it is impossible to achieve direct addition and subtraction, and it is difficult to combine with the written calculation of modern mathematics education, and the current teaching does not encourage students to learn mathematics by reciting and memorizing.

The traditional abacus is manufactured and used as a calculation tool. With the appearance of the calculator, the calculation function of the abacus is rarely used. It is more used as a tool for learning mathematics. The traditional abacus needs to follow the formula to dial the beads. The learning function is difficult to reflect, and the numbers cannot be displayed directly after the calculation

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