JP2014232200A - Teaching material for learning arithmetic - Google Patents

Teaching material for learning arithmetic Download PDF

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JP2014232200A
JP2014232200A JP2013112851A JP2013112851A JP2014232200A JP 2014232200 A JP2014232200 A JP 2014232200A JP 2013112851 A JP2013112851 A JP 2013112851A JP 2013112851 A JP2013112851 A JP 2013112851A JP 2014232200 A JP2014232200 A JP 2014232200A
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hole
counting
rod
longitudinal direction
notch
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JP5386048B1 (en
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孝明 三島
Takaaki Mishima
孝明 三島
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KOBUNSHOIN CO Ltd
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KOBUNSHOIN CO Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a teaching material for learning arithmetic which can be cut easily with scissors by a child as the need arises, while having strength required for counting the number or assembling a graphic form.SOLUTION: A teaching material for learning arithmetic is constituted of a plurality of counting rods 10 including a rod body 20 comprising a strip-like flat rod stock, a cut hole 50 penetrating a wide surface 21 of the rod body 20, a hole frame 51 constituting a hole edge along the longitudinal direction of the cut hole 50, and a notch 53 comprising a recessed part formed on the wide surface 21 of the hole frame 51.

Description

本発明は、小学校の算数の授業で用いられる学習教材に関する。   The present invention relates to a learning material used in elementary school arithmetic classes.

この種の従来の学習教材として、特許文献1に開示されたものが知られている。特許文献1に開示された図形棒は、短冊状の平棒材からなり、両端には、長手方向に沿って平行に突設された一組の突起からなる係合部を備えている。また、平棒材の各部には、係合部の突起が挿入可能に開口する係合孔が設けられている。そして、児童が係合孔に係合部を挿入することで、学習する図形を組立て、授業の理解を深めることが行なわれている。   As this type of conventional learning material, one disclosed in Patent Document 1 is known. The figure bar disclosed in Patent Document 1 is made of a strip-like flat bar material, and is provided with engaging portions made of a pair of protrusions protruding in parallel along the longitudinal direction at both ends. In addition, each part of the flat bar is provided with an engagement hole that is open so that a protrusion of the engagement part can be inserted. Then, by inserting the engaging portion into the engaging hole, the child assembles the figure to be learned and deepens the understanding of the lesson.

実用新案登録第3162980号公報Utility Model Registration No. 3162980

ところで、上記図形棒では、正三角形、正方形、立方体等、辺の長さが等しい図形を組立てることは可能であるが、二等辺三角形、長方形、平行四辺形、直方体等、長さの異なる辺が組合わされた図形を組立てることはできない。そこで、長さの異なる図形棒を予め用意する、必要に応じて図形棒を切断する等の対応が考えられる。   By the way, in the above-mentioned figure bar, it is possible to assemble figures with equal side lengths such as regular triangles, squares, cubes, etc., but sides with different lengths such as isosceles triangles, rectangles, parallelograms, rectangular parallelepipeds etc. You cannot assemble a combined figure. Accordingly, it is conceivable to prepare graphic bars having different lengths in advance, or to cut the graphic bars as necessary.

しかしながら、長さの異なる図形棒を予め用意する場合、1回の授業のためだけに図形棒を購入することになり、児童の家庭にとって負担が大きいという問題がある。   However, in the case where graphic bars having different lengths are prepared in advance, the graphic bars are purchased only for one class, and there is a problem that a burden is great for a child's home.

また、図形棒を切断する場合、図形棒は図形を組立てるために必要な強度を有しているため、児童がハサミで切断するには硬くて困難である。さらに、切断後の長さが不揃いとなる可能性が高く、授業の進行を妨げるおそれがある。このため、教師が所定の長さに切断した竹ひご等を児童の数だけ事前に準備することが行なわれているが、教師にとっての負担が大きいという問題がある。さらに長さの異なる図形棒を用意するのと同様に、1回の授業のためだけに竹ひご等を購入することになり、児童の家庭にとって負担が大きい。   Further, when cutting a figure bar, the figure bar has a strength necessary for assembling the figure, so that it is hard and difficult for a child to cut with a scissor. Furthermore, there is a high possibility that the lengths after cutting will be uneven, which may hinder the progress of the lesson. For this reason, it is practiced that the teacher prepares bamboo straws or the like cut to a predetermined length in advance by the number of children, but there is a problem that the burden on the teacher is large. Furthermore, as with the preparation of graphic bars of different lengths, the purchase of bamboo balls etc. for one lesson is a big burden on the children's home.

そこで本発明は、上記事情を考慮し、数を数えたり、図形を組立てるために必要な強度を有しつつ、必要なときに児童がハサミで容易に切断することができる算数学習教材を提供することを目的とする。   In view of the above circumstances, the present invention provides an arithmetic learning material that allows a child to easily cut with scissors when necessary, while having the strength necessary for counting and assembling figures. For the purpose.

上記目的を達成する請求項1の発明は、短冊状の平棒材からなる棒本体と、該棒本体の幅広面を貫通する切断孔と、該切断孔の長手方向に沿った孔縁を構成する孔枠と、該孔枠の該幅広面上に形成される凹部からなる切欠とを備えた複数の数え棒によって構成されることを特徴としている。   The invention of claim 1, which achieves the above object, comprises a bar body made of a strip-shaped flat bar, a cutting hole penetrating the wide surface of the bar body, and a hole edge along the longitudinal direction of the cutting hole. And a plurality of counting rods provided with a notch made of a recess formed on the wide surface of the hole frame.

請求項2の発明は、請求項1に記載の算数学習教材において、前記切欠は、前記孔枠の孔縁側が狭く、且つ浅く、幅方向外側縁部に向かって徐々に広く、且つ徐々に深く設定されたことを特徴としている。   According to a second aspect of the present invention, in the arithmetic learning material according to the first aspect, the notch is narrower and shallower on the hole edge side of the hole frame, gradually wider toward the outer edge in the width direction, and gradually deeper. It is characterized by being set.

請求項3の発明は、請求項1、または請求項2に記載の算数学習教材において、前記数え棒がポリプロピレンによって成形されていることを特徴としている。   According to a third aspect of the present invention, in the arithmetic learning material according to the first or second aspect, the counting rod is formed of polypropylene.

請求項4の発明は、請求項1〜請求項3のいずれか1項に記載の算数学習教材において、前記棒本体は、その長手方向における両端に、前記幅広面に沿って並列配置される一対の連結突起を備え、これら一対の連結突起は、先端側に向かって間隔が狭まるように、長手方向に対して斜めに配置されることを特徴としている。   According to a fourth aspect of the present invention, in the arithmetic learning material according to any one of the first to third aspects, the pair of bar bodies are arranged in parallel along the wide surface at both ends in the longitudinal direction. The pair of connection protrusions are arranged obliquely with respect to the longitudinal direction so that the distance between the connection protrusions decreases toward the distal end side.

請求項1、請求項2の発明によれば、孔枠の幅広面上に切欠を設けることで、棒本体の両端を持って撓ませた際に、切欠が起点となって数え棒を折曲げることができる。   According to the first and second aspects of the present invention, the notch is provided on the wide surface of the hole frame so that the counting rod is bent with the notch as a starting point when bent by holding both ends of the rod body. be able to.

請求項3の発明によれば、数え棒をポリプロピレンによって成形することによって、棒本体を折曲げた際に、孔枠の切欠部分が延伸されて細くなる。これによって、切断する際に、切断箇所である切欠の位置が明確になるとともに、非力な小学校低学年の児童でも容易にハサミで切断することが可能となる。   According to the invention of claim 3, by forming the counting rod from polypropylene, when the rod body is bent, the notch portion of the hole frame is elongated and becomes thin. As a result, when cutting, the position of the cutout, which is the cutting location, becomes clear, and even a weak elementary school child can easily cut with scissors.

請求項4の発明によれば、一対の連結突起の間隔を先端側に向かって狭くすることによって、図形を組立てた際に、一対の連結突起が相手側の連結突起、または孔枠を挟持し、組み上がった図形の形状を保持するのに十分な締結力を発揮する。これにより、授業中に組み上がった図形がバラバラに壊れることが減り、児童が授業に集中でき、より早く理解を深めることができる。   According to the invention of claim 4, when the figure is assembled by narrowing the distance between the pair of connection protrusions toward the distal end side, the pair of connection protrusions sandwich the mating connection protrusion or the hole frame. It exhibits a sufficient fastening force to hold the shape of the assembled figure. As a result, the figures assembled during the lesson are less likely to be broken apart, so that the child can concentrate on the lesson and deepen their understanding more quickly.

本発明の一実施形態を構成する数え棒を示す平面図である。It is a top view which shows the counting rod which comprises one Embodiment of this invention. 図1のII-II線に沿った断面図である。It is sectional drawing along the II-II line of FIG. 図1のIII部における要部拡大図である。It is a principal part enlarged view in the III section of FIG. 図1のIV-IV線に沿った断面図である。It is sectional drawing along the IV-IV line of FIG. 図1のV-V線に沿った断面図である。It is sectional drawing along the VV line of FIG.

以下、本発明の実施形態を図面に基づいて説明する。本実施形態の算数学習教材1は、図1〜図5に示すように、同一形状を備えた複数の数え棒10で構成されている。算数学習教材1は、机上に並べて数を数えたり、三角形や四角形といった平面図形を形成したり、あるいは直方体といった立体図形を組立てる等、算数におけるさまざまな授業で用いられる。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 5, the arithmetic learning material 1 of the present embodiment is composed of a plurality of counting bars 10 having the same shape. The arithmetic learning material 1 is used in various classes in arithmetic such as arranging numbers on a desk, counting numbers, forming a plane figure such as a triangle or a quadrangle, or assembling a solid figure such as a rectangular parallelepiped.

数え棒10は、図1に示すように、それぞれが、赤、青、黄、緑等に彩色されたポリプロピレンを射出成形することによって成形されている。数え棒10は、それぞれが、棒本体20、連結部30、組立孔40、および切断孔50で構成されている。なお、数え棒10は、長手方向の寸法が10cm程度に設定されている。   As shown in FIG. 1, each counting rod 10 is formed by injection molding polypropylene colored in red, blue, yellow, green or the like. Each counting rod 10 includes a rod body 20, a connecting portion 30, an assembly hole 40, and a cutting hole 50. The counting rod 10 has a longitudinal dimension set to about 10 cm.

棒本体20は、略長方形の断面形状を有する短冊状の平棒材で構成されている。棒本体20は、幅広面21の幅寸法Hが、板厚面22の板厚寸法Tの3倍となるように設定されている。また、棒本体20は、図5に示すように、長手方向に対して直交する幅方向の断面が略三角波形状を備えるように成形されている。   The rod body 20 is composed of a strip-shaped flat rod material having a substantially rectangular cross-sectional shape. The rod body 20 is set so that the width dimension H of the wide surface 21 is three times the plate thickness dimension T of the plate thickness surface 22. Further, as shown in FIG. 5, the rod body 20 is formed such that a cross section in the width direction orthogonal to the longitudinal direction has a substantially triangular wave shape.

各連結部30は、図1、図2に示すように、棒本体20の長手方向における両端に、長手方向に沿って突出するとともに、幅広面21に並列配置される一対の連結突起31と、これら連結突起31間に形成される凹部からなる連結凹部32とを備えている。つまり、幅広面21の幅方向に、連結突起31、連結凹部32、連結突起31の順で配置されている。そして、一対の連結突起31は、先端側に向かって間隔が狭まるように、長手方向に対して斜めに突設されている。各連結突起31の棒本体20からの突出寸法31aは、幅広面21の幅寸法Hと同一になるように設定されている。連結突起31は、その板厚面22方向の厚さ寸法31bと幅広面21方向の幅寸法31cが、ともに板厚Tと同一となるように設定されている。また、各連結突起31は、断面が円弧状の板厚面22と、対向する円弧面とによって、その断面が略円形に形成されている。   As shown in FIGS. 1 and 2, each connecting portion 30 protrudes along the longitudinal direction at both ends in the longitudinal direction of the rod body 20, and a pair of connecting projections 31 arranged in parallel on the wide surface 21, A connecting recess 32 formed of a recess formed between the connecting protrusions 31 is provided. That is, the connecting protrusion 31, the connecting recess 32, and the connecting protrusion 31 are arranged in this order in the width direction of the wide surface 21. The pair of connecting protrusions 31 are provided so as to protrude obliquely with respect to the longitudinal direction so that the interval is narrowed toward the distal end side. The projecting dimension 31 a of each connecting projection 31 from the rod body 20 is set to be the same as the width dimension H of the wide surface 21. The connection protrusion 31 is set so that the thickness dimension 31b in the direction of the plate thickness surface 22 and the width dimension 31c in the direction of the wide surface 21 are both equal to the plate thickness T. Moreover, each connection protrusion 31 is formed in the substantially circular cross section with the board | plate thickness surface 22 with a circular arc shape, and the opposing circular arc surface.

組立孔40は、幅広面21の幅方向中央に、幅広面21を板厚方向に貫通する長方形の孔で、長手方向の孔の中央が数え棒10を長手方向に1:1に分ける位置、および3:7に分ける位置の2箇所に配置されている。つまり、数え棒10を1:1に分ける組立孔40は、数え棒10の長手方向中央に配置され、数え棒10を3:7に分ける組立孔40は、後述する切欠53で切断された数え棒10の長い方10A(図1における切欠53よりも下側の部分)における長手方向中央に配置されている。組立孔40の長手方向の孔長寸法40aは、幅広面21の幅寸法Hと同じに設定されている。また、組立孔40の幅方向の孔幅寸法40bは、板厚面22の板厚寸法Tと同じに設定されている。さらに、組立孔40を形成する長手方向に沿った孔枠41の枠幅寸法41aは、板厚寸法Tと同じに設定されている。つまり、組立孔40は、数え棒10が挿入可能、且つ連結部30が孔枠41に嵌合可能な形状に形成されている。   The assembly hole 40 is a rectangular hole penetrating the wide surface 21 in the plate thickness direction at the center in the width direction of the wide surface 21, and the center of the hole in the longitudinal direction is counted to divide the rod 10 into 1: 1 in the longitudinal direction, And 3: 7. That is, the assembly hole 40 that divides the counting rod 10 into 1: 1 is arranged at the center in the longitudinal direction of the counting rod 10, and the assembly hole 40 that divides the counting rod 10 into 3: 7 is counted by a notch 53 described later. The rod 10 is arranged at the center in the longitudinal direction of the longer one 10A (the portion below the notch 53 in FIG. 1). A hole length dimension 40 a in the longitudinal direction of the assembly hole 40 is set to be the same as the width dimension H of the wide surface 21. Further, the hole width dimension 40 b in the width direction of the assembly hole 40 is set to be the same as the plate thickness dimension T of the plate thickness surface 22. Further, the frame width dimension 41 a of the hole frame 41 along the longitudinal direction forming the assembly hole 40 is set to be the same as the plate thickness dimension T. That is, the assembly hole 40 is formed in a shape in which the counting rod 10 can be inserted and the connecting portion 30 can be fitted into the hole frame 41.

切断孔50は、図1、図3、図4に示すように、幅広面21の幅方向中央に、幅広面21を板厚方向に貫通する長方形の孔で、長手方向の中央が数え棒10を長手方向に2:3に分ける位置に配置されている。切断孔50の長手方向の孔長寸法50aは、連結突起31の突出寸法31aの2倍となるように設定されている。つまり、切断孔50の長手方向中央で数え棒10を切断した際に、孔枠51が連結突起31と同じ長さで突出するように設定されている。また、切断孔50の幅広面21方向の孔幅寸法50bは、板厚面22の板厚寸法Tと同じに設定されている。さらに、切断孔50を形成する長手方向に沿った孔枠51の枠幅寸法51aは、板厚寸法Tと同じに設定されている。つまり、切断孔50は、数え棒10が挿入可能、且つ連結部30が孔枠51に嵌合可能な形状に形成されている。   As shown in FIGS. 1, 3, and 4, the cutting hole 50 is a rectangular hole penetrating the wide surface 21 in the plate thickness direction at the center in the width direction of the wide surface 21, and the center in the longitudinal direction is the counting rod 10. Are arranged at a position dividing 2: 3 in the longitudinal direction. The hole length dimension 50 a in the longitudinal direction of the cutting hole 50 is set to be twice the protrusion dimension 31 a of the connecting protrusion 31. That is, the hole frame 51 is set to protrude with the same length as the connection protrusion 31 when the counting rod 10 is cut at the longitudinal center of the cutting hole 50. Further, the hole width dimension 50 b in the direction of the wide surface 21 of the cutting hole 50 is set to be the same as the plate thickness dimension T of the plate thickness surface 22. Further, the frame width dimension 51 a of the hole frame 51 along the longitudinal direction forming the cutting hole 50 is set to be the same as the plate thickness dimension T. That is, the cutting hole 50 is formed in a shape in which the counting rod 10 can be inserted and the connecting portion 30 can be fitted into the hole frame 51.

なお、切断孔50の孔枠51における枠幅面52上の長手方向の中央には、切欠53が形成されている。切欠53は、切断孔50の孔枠51の孔縁側が狭く、且つ浅く、幅方向外側縁部に向かって徐々に広く、且つ徐々に深く設定されている。つまり、数え棒10を切欠53部分で切断した場合に、孔枠51が連結突起31と同じ長さで突出するように、切断孔50は形成されている。   A notch 53 is formed at the center in the longitudinal direction on the frame width surface 52 of the hole frame 51 of the cutting hole 50. The notch 53 is set so that the hole edge side of the hole frame 51 of the cutting hole 50 is narrow and shallow, gradually widens toward the outer edge in the width direction, and gradually deeper. That is, the cutting hole 50 is formed so that the hole frame 51 protrudes with the same length as the connection protrusion 31 when the counting rod 10 is cut at the notch 53 portion.

次に、数え棒10を切断する際の手順を説明する。まず、数え棒10の両端の連結部30を持って、棒本体20を撓ませつつ、連結部30同士を近づける。すると、数え棒10がポリプロピレンによって成形されていることによって、破損せずに、棒本体20が、切欠53部分で2つに折れ曲がり、背側の切欠53部分が引き伸ばされる。次に、切欠53部分の背側が折り目の内側になるように折り返し、新たに背側になった切欠53部分を引き伸ばす。そして、切欠53部分の両面が引き伸ばされることによって、切欠53が局部的に薄く、細くなる。最後に、引き伸ばされた切欠53部分をハサミ等を用いて切断する。   Next, a procedure for cutting the counting rod 10 will be described. First, holding the connecting portions 30 at both ends of the counting rod 10, the connecting portions 30 are brought closer to each other while the rod body 20 is bent. Then, since the counting rod 10 is formed of polypropylene, the rod main body 20 is bent in two at the notch 53 portion without being damaged, and the notch 53 portion on the back side is stretched. Next, the notch 53 is folded back so that the dorsal side of the notch 53 is inside the fold, and the notch 53 that is newly on the dorsal side is stretched. And by extending both sides of the notch 53 portion, the notch 53 is locally thin and thin. Finally, the elongated cutout 53 is cut using scissors or the like.

上記のような数え棒10を用いて、一対の連結突起31間の連結凹部32に、他の数え棒10の孔枠41,51、または連結突起31を嵌め入れることで、平面図形を形成したり、立体図形を組立てる。なお、正三角形や正方形、立方体のように、図形の各辺が等長の場合には、数え棒10をそのままの長さで使用し、二等辺三角形や長方形、直方体のように図形の各辺の長さが異なる場合には、数え棒10を切断して使用する。   By using the counting rod 10 as described above, the plane frame is formed by fitting the hole frames 41 and 51 of the other counting rod 10 or the connecting protrusion 31 into the connecting recess 32 between the pair of connecting protrusions 31. Or assembling solid figures. In addition, when each side of the figure is the same length, such as an equilateral triangle, a square, or a cube, the counting bar 10 is used as it is, and each side of the figure, such as an isosceles triangle, a rectangle, or a rectangular parallelepiped. When the lengths are different, the counting rod 10 is cut and used.

以上、本発明では、数え棒10をポリプロピレン製とすることで、作業中の児童の力が過度に加わり、棒本体20が撓み、曲がっても破損しないので、授業の進行を妨げることがない。   As described above, in the present invention, since the counting rod 10 is made of polypropylene, the child's power during the operation is excessively applied, and the rod main body 20 is not damaged even if it bends and bends.

また、数え棒10をポリプロピレン製とすることで、連結突起31が適度な弾力を有するため、一対の連結突起31を相手側の連結突起31、または孔枠41,51に嵌め込む際に、非力な児童の作業を妨げることが無いとともに、図形を組立てた際に、一対の連結突起31が相手側の連結突起31、または孔枠41,51を挟持し、組み上がった図形の形状を保持するのに十分な締結力を発揮する。これにより、授業の最中に、組み上がった図形がバラバラに壊れることが減り、児童が授業に集中できるとともに、組み上がった図形を手に取って様々な角度、方向から観察することができるため、児童が図形の構成について、より良く理解を深めることができる。   In addition, since the counting rod 10 is made of polypropylene, the connecting projection 31 has an appropriate elasticity, so that when the pair of connecting projections 31 are fitted into the mating connecting projection 31 or the hole frames 41 and 51, there is no force. The pair of connecting projections 31 hold the mating connecting projections 31 or the hole frames 41 and 51 and hold the shape of the assembled figure when the figure is assembled. Exhibits a sufficient fastening force. As a result, the assembled figures are less likely to break apart during the lesson, so that the child can concentrate on the lesson and can observe the assembled figures from various angles and directions. Students can better understand the composition of figures.

そして、切断孔50の孔枠51の枠幅面52上に切欠53を設けることで、棒本体20の両端を持って撓ませた際に、切欠53が起点となって数え棒10を折曲げることができる。   And by providing the notch 53 on the frame width surface 52 of the hole frame 51 of the cutting hole 50, when the both ends of the rod body 20 are bent and bent, the counting rod 10 is bent starting from the notch 53. Can do.

さらに、数え棒10をポリプロピレンによって成形することによって、棒本体20を折曲げた際に、孔枠51の切欠53部分が引き伸ばされて細くなる。これによって、切断する際に、切断箇所である切欠53の位置が明確になるとともに、非力な小学校低学年の児童でも容易にハサミで切断することが可能となる。   Further, by forming the counting rod 10 from polypropylene, when the rod body 20 is bent, the notch 53 portion of the hole frame 51 is stretched and thinned. As a result, when cutting, the position of the cutout 53, which is a cutting point, becomes clear, and even a weak elementary school child can easily cut with scissors.

なお、本実施形態の算数学習教材1では、数え棒10がポリプロピレンで構成されているが、同様の特性を有する樹脂材を使用することも可能であり、同様の作用効果を得ることができる。   In the arithmetic learning material 1 of the present embodiment, the counting rod 10 is made of polypropylene. However, it is possible to use a resin material having the same characteristics, and the same effects can be obtained.

1…算数学習教材
10…数え棒
20…棒本体
21…幅広面
31…連結突起
50…切断孔
51…孔枠
53…切欠
DESCRIPTION OF SYMBOLS 1 ... Arithmetic learning teaching material 10 ... Counting rod 20 ... Bar main body 21 ... Wide surface 31 ... Connection protrusion 50 ... Cutting hole 51 ... Hole frame 53 ... Notch

Claims (4)

短冊状の平棒材からなる棒本体と、
該棒本体の幅広面を貫通する切断孔と、
該切断孔の長手方向に沿った孔縁を構成する孔枠と、
該孔枠の該幅広面上に形成される凹部からなる切欠とを備えた複数の数え棒によって構成されることを特徴とする算数学習教材。
A bar body made of a strip-shaped flat bar,
A cutting hole penetrating the wide surface of the rod body;
A hole frame constituting a hole edge along the longitudinal direction of the cutting hole;
An arithmetic learning material comprising a plurality of counting rods provided with a notch formed of a recess formed on the wide surface of the hole frame.
請求項1に記載の算数学習教材において、
前記切欠は、前記孔枠の孔縁側が狭く、且つ浅く、幅方向外側縁部に向かって徐々に広く、且つ徐々に深く設定されたことを特徴とする算数学習教材。
In the arithmetic learning material according to claim 1,
The arithmetic learning material according to claim 1, wherein the notch is set so that the hole edge side of the hole frame is narrow and shallow, gradually widened toward the outer edge in the width direction, and gradually deeper.
請求項1、または請求項2に記載の算数学習教材において、
前記数え棒がポリプロピレンによって成形されていることを特徴とする算数学習教材。
In the arithmetic learning material according to claim 1 or claim 2,
An arithmetic learning material, wherein the counting rod is formed of polypropylene.
請求項1〜請求項3のいずれか1項に記載の算数学習教材において、
前記棒本体は、その長手方向における両端に、前記幅広面に沿って並列配置される一対の連結突起を備え、
これら一対の連結突起は、先端側に向かって間隔が狭まるように、長手方向に対して斜めに配置されることを特徴とする算数学習教材。
In the arithmetic learning teaching material according to any one of claims 1 to 3,
The rod body includes a pair of connecting protrusions arranged in parallel along the wide surface at both ends in the longitudinal direction,
The arithmetic learning material characterized in that the pair of connecting protrusions are arranged obliquely with respect to the longitudinal direction so that the interval is narrowed toward the tip side.
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