CN2190802Y

CN2190802Y - Multiple variable inlet abacus

Info

Publication number: CN2190802Y
Application number: CN 93231354
Authority: CN
Inventors: 孟繁鹤
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-07-10
Filing date: 1993-07-10
Publication date: 1995-03-01
Anticipated expiration: 2003-07-10

Abstract

The utility model relates to a multiple variable oral arithmetic disk which is composed of a big disk, a small disk and a circle center shaft which can cause the utility model to be combined and to relatively move. The mesosphere of the small disk is uniformly provided with a plurality of round figures, and the outer ring of the small disk is provided with an operation symbol. A circle of display windows arranged in the shape of spiral is arranged on the disk surface of the big disk, a plurality of round figures are uniformly distributed on the outer ring of a facade, the outer ring of a reverse side is provided with the round figures which are identical to corresponding numbers of the facade and the reverse side of the small disk is provided with a corresponding result number of each round figure of the mesosphere of the facade of the small disk and each round figure of the outer ring of the facade of the big disk which are mutually calculated. The utility model has the advantages of simple structure and low manufacturing cost, and the utility model can put forward questions to students in a transpositional way by rotation and students carry out oral arithmetic exercise. Therefore, the utility model is an ideal article for improving student's computational ability and developing intelligence.

Description

Multiple variable inlet abacus

The utility model belongs to the education skill scope, relates to a kind of students' supplies, is the calculating dial that a kind of student of help does a sum orally and practises.

The syllabus regulation: " computing power of cultivating the student will be paid attention to basic mental arithmetic exercise.Mental arithmetic is the basis of written calculation, estimation, letter calculation, also is the important component part of computing power, must adhere to doing constant practice, and progressively reaches on top of." student's mental arithmetic exercise at present generally only limits to lead white silk by the teacher on the classroom; the time is short, exercise question is few, narrow range; it is also very limited that class is copied topic to the student down; the parents of student seldom can grasp the main points of exercise again; be difficult to accomplish frequent coaching; so the basic work difference of the mental arithmetic of Most students, and the error rate height in causing calculating.

Task of the present utility model provides a kind of changeable mental arithmetic dish, for student's mental arithmetic that does constant practice, and can carry out product test voluntarily, improves student's calculating basic training, to overcome present existing above-mentioned deficiency.

Task of the present utility model realizes with following scheme: it is by a big disk and a roundel and their combinations and relatively turnable concentric shafts are constituted.Below in conjunction with accompanying drawing the utility model is elaborated:

Fig. 1 is the mental arithmetic dish front view that the utility model is used to add and subtract

Fig. 2 is used to the mental arithmetic dish reverse view that adds, subtract

Fig. 3 is the mental arithmetic dish front view that is used for multiplication and division

Fig. 4 is the mental arithmetic dish reverse view that is used for multiplication and division

Fig. 5 is used for multiplication and division mental arithmetic dish roundel reverse view

Fig. 6 is used for multiplication and division mental arithmetic dish big disk front view

According to Fig. 1, shown in Figure 3, the utility model is by big disk 1, and roundel 2 and their concentric shafts 3 constitute, and the reverse side of the front of big disk 1 and roundel 2 merges, and circle core shaft 3 passes their center of circle and they are relatively rotated.

Roundel 2 just to look like Fig. 1 shown in Figure 3, there is sign of operation (+or *) outer ring, centre circle has several integers, and the result of calculation of several these face appointments is arranged around the inner ring center of circle; The reverse side of roundel 2 has the corresponding number of results of each integer calculations of positive outer ring of each integer of front centre circle and big disk 1 as shown in Figure 5.

Have one on the card of big disk 1 and enclose into the display window 4 that appears roundel 2 reverse side result of calculation numbers that helix is arranged; There is a circle integer the positive outer ring of big disk 1, as shown in Figure 6; The reverse side of big disk 1 such as Fig. 2, shown in Figure 4, the outer ring has and the identical integer of positive corresponding numeral, and centre circle is sign of operation (or ÷); The result that several these face mental arithmetic appointments are also arranged around the inner ring center of circle.

During use, if the sign of operation of the outer ring of front roundel 2 is "+" number, then the front can be used for addition mental arithmetic exercise, as shown in Figure 1.Rotation roundel 2 makes a certain number on the roundel align as " 5 " with a certain integer on the big disk 1 as " 8 " and sign of operation thereof, then the formula of composition " 5+8 ".Whether the available corresponding result " 13 " who demonstrates in the window that appears that should mental arithmetic dish reverse side correspondence checks mental arithmetic correct after the mental arithmetic.The reverse side of this mental arithmetic dish then can be used for subtraction mental arithmetic exercise as shown in Figure 2.Method is: rotation roundel 2 make a certain on big disk 1 reverse side appear certain number on roundel 2 reverse side that appear in the window as " 13 " as minuend, align as " 5 " and sign of operation with a certain integer of this face outer ring of big disk, then form the subtraction formula of " 13-5 ".Addend " 8 " after the mental arithmetic in the addition formula " 5+8 " of available positive correspondence is checked the result of mental arithmetic.

If the sign of operation of the outer ring of front roundel 2 is " * " number, then the front can be used for multiplication mental arithmetic exercise, rotating roundel 2 as shown in Figure 3 makes a certain numerical example on the roundel 2 as " 5 " and sign of operation, align as " 9 " with a certain numeral in big disk 1 outer ring, the multiplication formula of then forming " 9 * 5 ", whether the corresponding result " 45 " that available reverse side correspondence appears the roundel reverse side that shows in the window after the mental arithmetic checks the mental arithmetic result correct.The reverse side of this mental arithmetic dish as shown in Figure 4, can be used for the mental arithmetic exercise of division, method is a rotation roundel 2, make on the big disk a certain appear window demonstrate some numerals on the roundel reverse side as " 36 " as dividend, with a certain number of this face outer ring of the big disk corresponding with display window, for example " 4 " have then formed the formula of " 36 ÷ 4 " as divisor.Factor " 9 " in available should the mental arithmetic dish positive formula " 4 * 9 " corresponding with it of its mental arithmetic result is checked.

Add in addition, subtract, take advantage of, the center of circle of removing four faces all has the result of calculation of several these face appointments on every side, but instruction of papil finds out all corresponding formulas at this face for the result of calculation of appointment during exercise, make a comparison then, think of, do you have been familiar with what rule? as: add in the normal plane " 13 " this designated result to Fig. 1 and find out all corresponding formulas at this face 3+10=13 is arranged, 4+9=13,5+8=13,6+7=13,7+6=13,8+5=13,10+3=13 is then by making a comparison, think of and to be familiar with two rules: (1) two number addition, an addend increases by a number, and another addend reduces identical number, they with constant.(2) two number additions, the exchange addend the position they with constant.

The utility model, modern design, simple in structure, have the changeable characteristics of a dish.If variable more than 200 the different mental arithmetic formula that swap out of each cloth 10 number of outer ring of large and small disk.Whole multiplication and divisions within emphasis exercise 20 is determined with all interior carry additions, give up the throne subtraction and multiplication mouth, and related to the problem of relevant " 0 " in the computing; Can also carry out in dish, finding out the exercise of all corresponding formulas in addition to designated result.Particularly should possess the performance that reverse side can show result of calculation at any time by the mental arithmetic dish, this not only can make the student judge correcting errors of mental arithmetic immediately voluntarily, thereby and excited students'interest in learning, promote that the student does constant practice.If can use this mental arithmetic dish to adhere to doing constant practice, not only computing power can be significantly increased the student, and intelligence also can be developed faster from little.

Claims

1, a kind of changeable mental arithmetic dish, it is characterized in that it by a big disk 1 and a roundel 2 and make large and small disk in conjunction with and relatively turnable circle core shaft 3 constituted; There is sign of operation the positive outer ring of roundel 2, and centre circle is evenly equipped with several integers, and reverse side has centre circle each integer in front to calculate corresponding number of results mutually with big disk 1 each integer of positive outer ring; Have one on the card of big disk 1 and enclose into the display window 4 that appears roundel 2 reverse side result of calculation numbers that helix is arranged, uniform several integers in the positive outer ring of big disk 1, the reverse side outer ring has and the identical integer of positive corresponding numeral.

2, mental arithmetic dish according to claim 1 is characterized in that said roundel 2, and the number of results of this face mental arithmetic appointment is arranged around its inner ring center of circle, front.

3, mental arithmetic dish according to claim 1 is characterized in that said big disk 1, and the number of results of this face mental arithmetic appointment is arranged around its reverse side inner ring center of circle.