Clamping type direct adding and subtracting number-display abacus

Abstract

The invention discloses a clamping 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 frame, partition rods, upper beads, lower beads and a beam. The upper beads are threaded through by the partition rods above the beam, grooves are arranged on the partition rods below the beam, bulges are disposed at both sides of each lower bead for matching with the partition rods, and the bulges are clamped between every two adjacent partition rods; the beam divides the beads into a structural form of or , namely, two or three upper beads on the top deck and nine lower beads on the bottom deck; and each lower bead has two bottom faces, 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

Images