JPS5813373Y2 - Display device for abacus teaching - Google Patents

Description

[Detailed explanation of the invention] This invention is based on the calculation process of multiplication and division by arithmetic, the multiplication position of each partial product in the case of multiplication, the multiplication position of each partial product in the case of division, and the position of multiplication of each partial product in the case of division. This invention relates to a display device for abacus training that concretely represents a position.

In the past, explanations of cases in which abacus can be saved were easy for upper grade students to understand, but it was difficult to get lower grade students to understand them quickly.

This proposal was developed with the aim of resolving these teaching difficulties.

To explain the present invention with reference to the embodiment shown in the drawings, reference numeral 1 denotes a guide raceway plate that is attached in the front longitudinal direction of the frame edge 3 on the near side of the abacus 2, that is, in the lateral direction, and the guide raceway plate has an end face T.
A long guide hole 4 in the shape of a letter is provided.

5 is a sliding piece having a required width with an engaging piece 6 having a T-shaped end face engaged with the guide slot 4 on the front side, and the upper end 1 is attached to the upper surface side of the front frame edge 3 of the abacus 2. A folding display plate 7 is provided which can be folded approximately at right angles.

ga and gb are edge markers displayed on the front edge of the folding display plate 7 at intervals equal to the spacing between the bead axes 9, and immediately after the edge marker 8a are numbers 10 to 90, The numbers 1 to 9 are written immediately after the sign 8b.

In arithmetic, for example, in the case of multiplication, there is the question of where to place the multiplication and sum, where to add the individual partial products to the 10's place or the 1's place, and in the case of division, where to set the answer, and the question of where to place the answer, and the question of where to place the answer. When subtracting partial products, there are issues such as where to place the tens digit and where to place the vehicle in the ones digit.

Regarding these points, currently, in the case of multiplication, the multiplication and sum position of partial products is multiplied by 9, and when ``ga'' is added to 9, it is skipped one digit from the multiplicand and added to the right side, and it becomes 9, 9. If there is no , add the number immediately to the right of the multiplicand, and in the case of division, if the leading number of the dividend has the leading number of the divisor, place the leading number of the dividend one digit to the left, and add the leading number of the dividend. If the number does not have the leading number in the divisor, they are taught in abstract terms, such as placing the number directly to the left of the leading dividend. There are many miscalculations due to errors.

In the present invention, these drawbacks are overcome by the above-mentioned structure, that is, by the sliding operation of the sliding piece having the folding display plate 7.

An example of how this proposal can be used is as follows.

First, when multiplying, if you spread 21x6 on the board, Figure 5.
As shown in FIG. 6, the multiplicand 1 is multiplied by the multiplier 6.

Therefore, place the digits 10 to 90 displayed on the display board 7 of the sliding piece 5 on the right side of the multiplicand 1, and by this, 1×
Since the tens digit and the ones digit where 6 multiplies and sums the partial products of 6 are concretely shown on the display board, the partial product 6 is added to 1 to 9 on the display board.

Since the calculation for the multiplicand 1 is completed, pay the multiplicand by 1.

Next, we will multiply the multiplicand 2 by the multiplier 6, so the multiplicand 2
Move the digits 10 to 90 on the display board to the right side of .

2×6=12 is displayed on the display board to the right of the multiplicand as 10 to 9.
The 0 digit, the digits next to it, the 1 to 9 digits, and the multiplication sum position are shown.

Add the partial product 10 of 2X6 = 12 to the 10th to 90th places on the display board, add 2 of 2X6 = 12 to the 1st to 9th places of the display board, and pay as the multiplicand 2 is completed.

Second, to explain the case of division, for example, 123÷
If you propagate 3 onto the board, it will look like Figure 7.

In other words, since it is divided by the divisor 3, the digits 1 to 9 on the display board are 1 of the dividend.
Move it to the position.

Comparing the dividend number 1 and the divisor number 3, there is no 3 in l, so the display board is moved one digit to the right.

The dividend number is 1 in the 10th to 90th place on the display board, and the number is 1 to 9.
Since the dividend is 2 in the digit (see Figure 8), 12÷3
become.

12 ÷ 3 is the quotient 4, so the left side of the 10th to 90th places on the display board is always the vertical position where you make the answer, so put the quotient 4 next to the left side of the 10th to 90th places and get 3X4 = 12. Calculate the partial volume from the mounting position of 10 to 90 on the display board by 3 x 4 = 1 of 12
Subtract 0, then subtract 2 of 3X4=12 from the 1st to 9th places on the display board.

Next, the dividend is divided by the divisor 3, so move the digits 1 to 9 on the display board to the multiplicand 3 (see Figure 9).3÷3 is the quotient 1.
Therefore, the left side of the display board from 10 to 90 is always in the vertical position, so put the quotient 1 on the left side of the display board (1st
(Figure 0) Subtract 3 from the mounting position of the 1st to 9th place on the display board to obtain the partial product of 3X1=3.

As described above, according to the present proposal, a guide track plate is provided horizontally in front of the front side frame edge of the abacus, and a sliding piece is attached to the guide track plate so as to be freely slidable. The moving piece is bent at the upper end at an approximately right angle to the upper surface of the front frame edge of the abacus.
A substantially parallel corresponding folding display board is extended and formed,
Two edge signs are attached to the front edge of this display board with an interval equal to the spacing between the beads, and numbers 1 to 9 are placed immediately after the sign on the right side, and numbers 1 to 9 are placed immediately after the sign on the left side. 10 for
Since each number from ~90 is written on it, it can be attached to a small abacus for general education, and the folding display board extended from the top of the sliding piece is held down with your finger from above and moved from side to side. Moreover, since the markings are specifically attached to this display board, it is easy to align it with the tragus axis.Furthermore, the left and right markings mark the two digits from 10 to 90.
Since it is written with specific numbers 1 to 9, the place where the partial products are multiplied and summed in the case of multiplication is specifically shown. The position next to the display is always vertical, and the loading position of the partial product of the division is specifically indicated by a sign on the folding display board. However, it is visually understandable and does not hinder practice at all.

Therefore, this proposal has a great effect on helping abacus learners learn how to multiply and divide quickly and accurately.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; Fig. 1 is a plan view, Fig. 2 is a front end view, Fig. 3 is a sectional view taken along line A-A, and Fig. 4 is a slide equipped with a display board. A perspective view of the moving piece, Figures 5 and 6 are explanatory diagrams showing how to perform multiplication, and Figures 7 to 10.
The figure is an explanatory diagram showing how to perform division. 1... Guide raceway plate, 2... Abacus, 3.
... Frame edge, 4 ... Guide slot, 5 ...
... Sliding piece, 6 ... Engagement piece, 7 ... Folding display board, 8a, 8b ... Flange mark, 9 ...
...Bead axis.

Claims (1)

[Scope of utility model registration request] A guide track plate 1 of a required length is provided in the horizontal direction in front of the front side frame edge 3 of the abacus 2, and a sliding piece 5 that can freely slide in the horizontal direction is attached to the guide track plate 1. 5, a folding display plate 7 that is bent approximately at right angles to the upper surface of the front frame edge 3 of the abacus 2
At the same time, two protruding marks 8a and 8b are attached to the front edge of the display board 7 at an interval equal to the interval of the bead axis 9, and numbers 1 to 9 are placed immediately after the mark 8a on the right side. A display device for teaching arithmetic arithmetic, which is characterized in that numbers 10 to 90 are written immediately after the sign 8b on the left side.