CN201812401U

CN201812401U - Fractional arithmetic demonstration instrument

Info

Publication number: CN201812401U
Application number: CN2010205641697U
Authority: CN
Inventors: 欧会
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-10-15
Filing date: 2010-10-15
Publication date: 2011-04-27
Anticipated expiration: 2020-10-15

Abstract

The utility model discloses a fractional arithmetic demonstration instrument, which consists of a demonstration board, three counting boards, six sheltering boards and a symbol changing board. The counting boards, the sheltering boards and the symbol changing board are connected with the demonstration board rotationally. Each counting board corresponds to two sheltering boards and the matched counting board and the sheltering board are coaxial and can rotate mutually. Each two sheltering boards are overlapped. The counting boards are arranged among the demonstration board and the sheltering boards. The utility model has the beneficial technical effect that different arithmetic examples can be demonstrated for students through the mutual combination of the counting boards, the sheltering boards and the symbol changing board so that teaching process becomes interesting and the attention of underage children can be focused on teaching conveniently.

Description

The fractional arithmetic demonstrator

Technical field

The utility model relates to a kind of teaching aid, relates in particular to a kind of fractional arithmetic demonstrator.

Background technology

Underage child is preferred thinking in images when study, if knowledge can be combined with in kind, cooperate visual illustration in oral education, can improve the learning efficiency of underage child, therefore, needs some special teaching aids of design to come aided education.

The utility model content

Mathematical education for auxiliary underage child the utility model proposes a kind of fractional arithmetic demonstrator, and it is made up of demonstration board, three tallies, six shutters and sign reversing plate; Tally, shutter and sign reversing plate all are rotationally connected with demonstration board; Wherein, corresponding two shutters of each tally, and tally that matches each other and the coaxial mutual rotation of shutter, per two overlapping settings of shutter, tally is arranged between demonstration board and the shutter.

Described tally is circular, is marked with numeral on the tally.

Described shutter is a semicircular plate.

Useful technique effect of the present utility model is: by the mutual combination of tally, shutter and sign reversing plate, for the student demonstrates out different examples, make the teaching process vivid and interesting, the notice of underage child is well concentrated, be convenient to teaching.

Description of drawings

Fig. 1, the utility model structural representation;

Among the figure: demonstration board 1, three tallies 3, six shutters 4, sign reversing plate 5.

Embodiment

The utility model structure is: it is made up of demonstration board 1, three tallies 3, six shutters 4 and sign reversing plate 5; Tally 3, shutter 4 and sign reversing plate 5 all are rotationally connected with demonstration board 1; Wherein, each tally 3 corresponding two shutter 4, and tally 3 that matches each other and shutter 4 coaxial mutual rotations, per two shutters, 4 overlapping settings, tally 3 is arranged between demonstration board 1 and the shutter 4.

Described tally 3 is circular, is marked with numeral on the tally 3.

Described shutter 4 is a semicircular plate.

Tally 3, shutter 4, sign reversing plate 5 and " equal sign " mark are arranged on the demonstration board 1 by equation form; During concrete operations, strip plate on the sign of rotation converter plate 5, it can be used as " multiplication sign ", " minus sign " or " plus sige ", rotate two shutters 4 and adjust gap position, the numerical portion of mark on the tally 3 is exposed, according to the combination of the different digital on three tallies 3, form different computing equatioies.

In oral teaching, the teacher can well attract the notice of underage child to operation of the present utility model, improves children's learning efficiency, but also has saved the trouble with regard to the demo content writing blackboard.

Claims

1. fractional arithmetic demonstrator, it is characterized in that: it is made up of demonstration board (1), three tallies (3), six shutters (4) and sign reversing plate (5); Tally (3), shutter (4) and sign reversing plate (5) all are rotationally connected with demonstration board (1); Wherein, corresponding two shutters (4) of each tally (3), and tally that matches each other (3) and the coaxial mutual rotation of shutter (4), the overlapping setting of per two shutters (4), tally (3) is arranged between demonstration board (1) and the shutter (4).

2. fractional arithmetic demonstrator according to claim 1 is characterized in that: described tally (3) is for circular, and tally is marked with numeral on (3).

3. fractional arithmetic demonstrator according to claim 1 is characterized in that: described shutter (4) is a semicircular plate.