### General comment

This competition was planned to commemorate the designation of March 14 each year as “International Day of Mathematics” which is proclaimed by UNESCO in 2019, and it was held as part of the “UNESCO Future Co-creation Platform Project” implemented by the Ministry of Education, Culture, Sports, Science and Technology. We sought applications with posters and videos on the theme of “the connection between mathematics and society” from the students in the secondary education stage both domestically and internationally. The purpose was “To provide an opportunity for secondary education students

to deepen understanding of the connection between mathematics in society and,

to increase interest and motivation to learn mathematics. ” and “To provide an opportunity for young people across countries to exchange ideas while having cross-cultural exchange through the publication of award-winning works”.

In spite of a short period of time for project preparation and application, we are pleased to inform you that we have received 125 posters and 22 videos. We would like to express our deep gratitude to all the leaders who have been developing their understanding of SDGs and actively engaged in activities.

All of the works we received are excellent, and there are many variations of works such as those that relate social issues and mathematics and those that try to discover mathematics from nature, culture, music, sports, etc. It made me experience “various perspectives of teenagers”. The quality of the videos produced by students from the secondary schools are also noteworthy.

We hope that this competition develops understanding of SDGs as well as various social issues especially for young people, and further expands activities for a sustainable society.

Chairman of The Mathematics Certification Institute of Japan

Shizumi Shimizu

`List of excellent works`

#### Posters

#### Excellent work Judge’s prize (10 points)

##### Judge award by Ms. Ikushige

#### MATH × Ino Tadataka

**大橋 紡さん**

（東京成徳大学高等学校1年、東京都）

＜Comment from the judge＞

Astronomer, geographer, and surveyor, Ino Tadataka has spent 17 years revealing the exact picture of Japan’s land, and I think his achievements are easy to understand as an example of mathematics utilization for junior high school students, high school students, and adults.

#### 身近な数字と白銀比（Familiar mathematics and silver ratio）

**兼子 優美子さん**

（大阪市立水都国際高等学校2年、大阪府）

＜Comment from the judge＞

The ingenuity of paper which is reminiscent of silver paper and the character suffering from mathematical formulas are impressive. It was fun to imagine that the character started to move with animation, reached Horyuji Temple, and met Prince Shotoku in front of the five-storied pagoda

##### Judge award by Ms. Komaki

#### Origami cranes are made of mathematics

**大久保 奏佑さん、岡田 旭彦さん、堀田 知弥さん、元田 堅心さん**

（三田国際学園高等学校１年、東京都）

＜Comment from the judge＞

With the theme of *Origami*, which is known that “Origami International Conference” is held regularly and has the potential to be a geometrical target to explore, the work is simple in color and design, but has an impact. I don’t know if it was the creator’s intention, but I was very impressed by the design of the crane as it is a symbolic image of the sustainable world and peace that the SDGs are aiming for.

#### MATH & TETRON

**染谷 美吹さん**

（東京成徳大学高等学校1年、東京都）

＜Comment from the judge＞

Based on the TETRON game, which is familiar to the young generation, it is effective to ask a brief question that instantly draws us into a mathematical point of view from the perspective of the player and the programmer. In addition, the colors and composition are beautiful, and I was fascinated by it.

##### Judge award by Dr. Sato

#### Mathematics is a beautiful tradition.

**山崎 瑠璃香さん**

（鵠沼高等学校2年、神奈川県）

＜Comment from the judge＞

This work emphasizes that many geometric designs are adopted in traditional Japanese beauty. It expresses the connection between Japanese culture and mathematics that is inherent in sophisticated beauty, and is evaluated as an international message.

##### Judge award by Ms. Shinozaki

#### 数学と他教科の繋がり(Connection between mathematics and other subjects)

**田代 結香さん、内田 結菜さん**

（淑徳与野高校2年、埼玉県）

＜Comment from the judge＞

I was impressed by the concrete and easy expression of connection between mathematics and other subjects that are familiar to students. In particular, their sensibilities of using figures to express the connection between Japanese and English are wonderful. The whole work conveys the image that mathematics works together with other fields and cooperates to make use of it in the future.

#### Shapes made with chords

**鈴木 萌果さん**

（東京成徳大学高等学校1年、東京都）

＜Comment from the judge＞

I could feel her enjoying mathematics around her from the expression of the relationship between music and mathematics using the bright and pop of pastel colors. The process of forming a Mobius strip by connecting the same chords which are represented in triangles is expressed clearly.

It is also a wonderful work that the Mobius strip is actually created and practiced instead of an illustration.

##### Judge award by Mr. Shimizu

#### Probability of personal belongings

**相馬 琢人さん**

（東京成徳大学高等学校1年、東京都）

＜Comment from the judge＞

It is an interesting work that shows the probability of an event that can occur to anyone, not a specific person or thing. It is also interesting to show both the mathematically calculated probabilities and the statistically calculated probabilities based on the data.

##### Mathematics Certification Institute Award

#### World of Hz

**大城 明生さん**

（三田国際学園中学校2年、東京都）

＜Comment from the Mathematics Certification Institute of Japan＞

This poster expresses the relationship between frequency and mathematics and it is eye-catching with the visuals and contents. When I listened to the Fibonacci song from the QR code, I could feel the music lingering on and it spread with a mature tone and I would like Fibonacci to listen to it.

##### SDGs Platform Award

#### ただ解くだけじゃない！意外と身近な数学の世界 (Just solving it doesn’t stop! In fact, the familiar world of mathematics)

**松﨑 浩隼 さん**

（三田国際学園中学校 2年、 東京都）

＜Comment from the SDGs Platform Japan＞

We evaluate the idea that causes us to become aware of hyperbolic design of the things which is just a “Beautiful work / architecture” for those who are not particularly interested in mathematics.

It is also highly evaluated that there is an explanation that a straight line can form a curve and that a cylinder is deformed into a three-dimensional object with a hyperbola.

#### Movies

#### Excellent work Judge’s prize (5 points)

##### Judge award by Ms. Ikushige

#### 数学は世界言語 (Mathematics is a universal language)

**宮内 唯衣 さん**

（慶應義塾湘南藤沢高等部３年 、 神奈川県）

＜Comment from the judge＞

It is a work that conveys a message such as “Mathematics is universal and the strongest study beyond the language barrier!”. The familiar animation is used in this video, and that makes it easier for children and adults to understand.

##### Judge award by Ms. Komaki

#### Dogs face×Ellipse

**古川 万里子さん **

（東京成徳大学高等学校1年、東京都）

＜Comment from the judge＞

I could feel the warmth of the loving approach with the theme of her pet, Shiba dog.

While looking at the process of creating a design by combining ellipses, data analysis such as how to combine and how to take distances will lead to the development of characters that are loved. Also, I received the message in the end that the earth is rotating ellipses which can be called ‘imperfect circles’, and peace can be realized as a single planet by accepting various countries and cultures.

##### Judge award by Dr. Sato

#### Let’s think about Corona virus mathematically

**高校1年E組 殷 弥侑さん、井沢 百寧さん、今井 心美さん、増田 苺さん**

（三田国際学園高等学校１年、東京都）

＜Comment from the judge＞

The effects and risks of the COVID-19 pandemic phenomenon are visualized from multiple perspectives by utilizing mathematics. By bringing mathematical sense into Tokyo’s case as an example, it gives more concreteness and a stronger message. The quality of video production technology (narration, video technology, music, animation, etc.) is great, and as a judge, I would like to expect them to produce works continuously.

##### Judge award by Ms. Shinozaki

#### SDGs×Mathematics = Effective Disaster Prevention

**室戸高等学校１－２Hさん**

（高知県立室戸高等学校１年、高知県）

＜Comment from the judge＞

It is a very wonderful point of view that they are trying to utilize mathematics to save lives without leaving anyone behind in case of a disaster. The process of the experiment and examination was summarized in the video with music edited at a favorable tempo. I could see how everyone worked hard from the whole work.

##### Judge award by Mr. Shimizu

#### UM(Use Mathematics)

**三上 優文さん、森 駿介さん**

（三田国際学園高等学校１年、東京都）

＜Comment from the judge＞

This clearly shows that binary numbers are used in computers which are familiar to us. I was interested in this video as it is telling people that smartphones and PCs would work with just 0s and 1s.

##### Mathematics Certification Institute Award

#### Is the math useful in the future?

**井上 颯子さん、葛木 美奈さん、西川 玲奈さん、平形 日瑚 さん**

（三田国際学園高等学校 １年 、 東京都 ）

＜Comment from the Mathematics Certification Institute of Japan＞

This quotes the word “Everything is number” by Pythagoras who is the B.C. mathematician and shows the ratio of the connection between mathematics learned in high school and occupations, which we might think there is no connection with mathematics, such as photographers, chefs, and professional golfers. We hope more people will be interested in the connection between mathematics and occupations through this video .

##### SDGs Platform Award

#### One-third magic

**吉澤 未来さん、野村 実優さん、鈴木 愛美理さん**

（三田国際学園高等学校１年、東京都）

＜Comment from the SDGs Platform Japan＞

The wonder of “recurring decimals” itself has been talked about repeatedly among mathematicians. We think highly of their intention to convey the wonder to people who are not familiar with mathematics by using a birthday cake to celebrate the “birth” of “International Day of Mathematics” and cutting the cake into 3 pieces to connect with the theme.