This book has been produced in collaboration with the Colorful World Of Mathematics project team. This book contains math stories written by mixed country teams.

Preview audio:

storyj.mp/agemurqmmm64

ADVISORS

**Team 1- Nuray Tuncay Kara Science And Art Center (Gül ŞAHİN)

**Team 2- Yılmaz Çebi Secondary School (Öznur AKGÜL)

**Team 3-Çankaya Regional Boarding Secondary School(Merve AKYÜZ)

**Team 4-Çankaya Regional Boarding Secondary School (Tuğçe CALAP)

**Team 5-Secondary School ( Gökçe OKUMUŞ)

** Team 5- Os Milivoj Petkovic Fecko (Svetlana ILIC)

**Team6- Vali Mehmet Lütfullah Bilgin Secondary School (Mine KARA)

**Team 7-Rıfat Argün Secondary School (Ayşegül ER)

**Team 7-Zakladni Skola V. Talicha (Jaroslava NIKLOVA)

INGREDIENTS

Team 1 Work.................................... 4-7

Team 2 Work.................................... 8-11

Team 3 Work.................................... 12-16

Team 4 Work.................................... 17-20

Team 5 Work.................................... 21-24

Team 6 Work.................................... 25-28

Team 7 Work.................................... 29-32

TEAM 1

**Zeki-Yılmaz Çebi Secondary School (Öznur AKGÜL)

**Berat-Vali Mehmet Lütfullah Bilgin Secondary School (Mine KARA)

**Göknur-Çankaya Regional Boarding Secondary School(Merve AKYÜZ)

**Gökçe-Rıfat Argün Secondary School (Ayşegül ER)

**Duru-Atatürk Secondary School (Gökçe OKUMULŞ)

**Mertcan-Çankaya Regional Boarding Secondary School (Tuğçe CALAP)

**Ayşenaz-Nuray Tuncay Kara Science And Art Center (Gül ŞAHİN)

**Lukas-Zakladni Skola V. Talicha (Jaroslava NIKLOVA)

**Krstina- Os Milivoj Petkovic Fecko (Svetlana ILIC)

LAND OF NATURAL NUMBERS

In a country where natural numbers live, all natural numbers live happily. These numbers start from 0 and go to infinity. One day, 0 (zero) says that this country must have a president, that is, a leader, and zero nominates itself. Because when I enter the multiplication process with numbers, it says that I swallow those numbers and write the answer as zero. Candidates come from other numbers as well. 2 rebels, saying that he is the smallest prime number, and wants him to be president. 1 rebels and says that when he enters the multiplication operation with other numbers, he wants it to be himself because he does not change the value of the numbers. By the way, since 97 is the largest two-digit prime number, he also wants to be the leader. He rebels at 27 and says that the base and exponent are the same in our writing as an exponential number. So he says I will write as 3^3. He says he should be president.

6 rebels and says I'm a perfect number. Perfect numbers are numbers whose positive divisors are equal to itself. He says I should be president because I am 1+2+3=6. 10 objects and says I am also a triangular number, I must be the leader. Triangular numbers are the sum of n natural numbers from 1 to n. He says I am a triangular number because I am 1+2+3+4=10 and he wants to be a leader. Among other numbers, those who want to be leaders emerge and great turmoil ensues in the country. The wise Pi (3,14….) from his last irrational country comes and says I have all natural numbers in my content after the comma. Every number has its own beauty. He says there should not be a leader in the country. He says that everyone should live in love and respect, and no one should be above anyone else. Natural numbers are convinced. So the natural numbers continue to live happily in this realm. END.

**Melike Zeynep-Yılmaz Çebi Secondary School (Öznur AKGÜL)

**Şerzan-Vali Mehmet Lütfullah Bilgin Secondary School (Mine KARA)

**Enes-Çankaya Regional Boarding Secondary School(Merve AKYÜZ)

**Kayra-Rıfat Argün Secondary School (Ayşegül ER)

**Defne-Atatürk Secondary School (Gökçe OKUMULŞ)

**Muhammet-Çankaya Regional Boarding Secondary School (Tuğçe CALAP)

**Ecem-Nuray Tuncay Kara Science And Art Center (Gül ŞAHİN)

**Michelle-Zakladni Skola V. Talicha (Jaroslava NIKLOVA)

**Miljan- Os Milivoj Petkovic Fecko (Svetlana ILIC)

TEAM 2

POWER OF ZERO

Country Of Numbers

Country Of

Exponents

POWER OF ZERO

Once upon a time, there was a country called the country of numbers. There lived four powerful heroes in this country, these heroes were Bombi, Mati, Algebra, Mates. There lived a very unhappy zero in this country. Zero was unhappy because he saw himself as weak. Because other numbers made fun of him, they would hit him in the face that he was useless and worthless. And zero would suffer a lot from that. Every day he would stand in front of the mirror and question himself. But in vain... Same thing tomorrow. Knowing this, the four heroes took it upon themselves to make zero happy. They decided to move to another country with Zero, who is unhappy in this country.

They went a little, they went far, they went straight up the creek and finally they reached the land of exponential numbers. As soon as he entered the country, he was scared and hid for a few days, thinking that the other numbers would not be among him again. Bombi, Algebra, Mates, and Mati helped Zero find his courage to pull him out of hiding. Then they went to other numbers living in the country. He was making the value "one" of every number he went to. All the numbers in the country of exponential numbers were very surprised by this situation. While they thought that zero had no power, they saw that it had a depreciating effect. They realize that all numbers are strong.

Zero felt more valuable and powerful in this country. He realized his worth. And all the numbers lived happily ever after.

**Berat-Yılmaz Çebi Secondary School (Öznur AKGÜL)

**Ali-Vali Mehmet Lütfullah Bilgin Secondary School (Mine KARA)

**Ayşe-Çankaya Regional Boarding Secondary School(Merve AKYÜZ)

**İrem-Rıfat Argün Secondary School (Ayşegül ER)

**Eylül-Atatürk Secondary School (Gökçe OKUMULŞ)

**Sena-Çankaya Regional Boarding Secondary School (Tuğçe CALAP)

**Hasan-Nuray Tuncay Kara Science And Art Center (Gül ŞAHİN)

**Kiki-Zakladni Skola V. Talicha (Jaroslava NIKLOVA)

**Vukasin- Os Milivoj Petkovic Fecko (Svetlana ILIC)

TEAM 3

WHOLE NUMBERS IN THE MALL

The Cebirsel family, who came to Istanbul from the village, went to visit their relative, the Rasyon family. They got bored and decided to go to the mall. They got ready and went to the mall. They couldn't find the parking lot. After wandering around for a while, they found the parking lot. After entering the parking lot, they could not find the elevator this time. After asking someone, they found the elevator. Ali from the Algebra family was surprised to see the numbers in the elevator. The Rational family thought it would be better to explain the situation to the Algebraic family with an example.

They handed the Algebraic family the paper and pen they had taken out of the bag. He asked them to write the numbers they knew on this piece of paper. The Algebraic family wrote down all the numbers they knew on paper. They studied the numbers written on the paper.

There were no negative numbers among the numbers written.

The Rational family asks the Algebraic family;

- Why are there no negative numbers here?

- What, are there also negative numbers?

-Yes, there are numbers with a negative in front of them. We call these Negative Integers. We are now on the minus second floor. We're going to the ground floor. They hit the zero button and went to the ground floor.

They entered a store and started shopping. They like a sweater and want to buy it. They went to the cashier to pay the fee. Rational family tried to pay by card. I got a message saying that the card is over the limit. So they paid in cash. The rational family is the algebraic family;

- "When we just bought sweaters, we lost money. We lost money." says.

If we want to show this with numbers, we put a minus in front of the number.

They then take the elevator to eat. They said, “We have to pick a number above zero, which is the start. So they went up to the fourth floor.

When they entered a restaurant, they learned that they were the thousandth customer. They gave a thousand lira gift certificate to the Cebirsel family. This check is valid inside the mall. The Algebra family also bought a gift to the Rational family with some of the money. They gave the remaining money to them. The rational family says that we can express this money you gave us with positive, that is, positive integers. The algebra family also thanks them for explaining them by applying integers. They left the mall and went home.

In this story, we told you which numbers are integers. Thank you for reading to the end.

**Berkay-Yılmaz Çebi Secondary School (Öznur AKGÜL)

**Hakan-Vali Mehmet Lütfullah Bilgin Secondary School (Mine KARA)

**Batuhan-Çankaya Regional Boarding Secondary School(Merve AKYÜZ)

**Simaynaz-Rıfat Argün Secondary School (Ayşegül ER)

**Ceylin-Atatürk Secondary School (Gökçe OKUMULŞ)

**Oğuzhan-Çankaya Regional Boarding Secondary School (Tuğçe CALAP)

**Aslı-Nuray Tuncay Kara Science And Art Center (Gül ŞAHİN)

**Nina-Zakladni Skola V. Talicha (Jaroslava NIKLOVA)

**Lazar- Os Milivoj Petkovic Fecko (Svetlana ILIC)

TEAM 4

The famous mathematician Greenwich, born in London, promised himself to make children who do not like mathematics love mathematics. Mathematics was not that common in London back then. He was doing fun activities while teaching math in greenwich london. For example; He was giving mathematics education similar to intelligence games in schools, he was teaching the lesson with fun, he was doing experiments, he was telling stories with fairy tales, he was making solutions about operations, he was telling math jokes and anecdotes, he was talking by chatting.

One day, while he was teaching, one of his students asked him why mathematics was important. greenwich replied to him as follows

He said that mathematics is used all over the world, for example, it is used when calculating when going to a shop, it is used when counting and adding in daily life, it is used when solving problems, when measuring length or shortness, when counting months and years and in similar situations. That's why math is so important, he said.

When the students heard these, they formed different feelings towards mathematics. They started to love math. they started to experiment on their own and create brain games. They even created such successful games that even famous mathematicians could not solve them. Then he tried to solve the brain teaser made by his students in Greenwich, and even he couldn't solve it. He was both surprised and very happy about this situation.

**Nurcan-Yılmaz Çebi Secondary School (Öznur AKGÜL)

**Furkan-Vali Mehmet Lütfullah Bilgin Secondary School (Mine KARA)

**M.Eren-Çankaya Regional Boarding Secondary School(Merve AKYÜZ)

**Kübra-Rıfat Argün Secondary School (Ayşegül ER)

**Buğlem-Atatürk Secondary School (Gökçe OKUMULŞ)

**Erdem-Çankaya Regional Boarding Secondary School (Tuğçe CALAP)

**Ahsen-Nuray Tuncay Kara Science And Art Center (Gül ŞAHİN)

**Misa-Zakladni Skola V. Talicha (Jaroslava NIKLOVA)

**Majk Milutin- Os Milivoj Petkovic Fecko (Svetlana ILIC)

TEAM 5

MATHS AROUND US

Ali is a curious student who loves mathematics. One day, he asks his mother where the subjects they learned in mathematics will come across. His mother tells him that there is actually math everywhere, just to look around a little more carefully. At that time, they enter the market to buy the needs of the house. They look at their list and see that different brands have different prices for the same product. For example, 1.5 kilos of one brand of yogurt is 18 TL, while 2 kilograms of another brand of yogurt is 20 liras. He realizes that he has started to divide in order to choose the most suitable products he needs. He tries to calculate the products he bought before paying the cashier, while he thinks that he is actually adding and subtracting decimal numbers.

As they leave the market and head towards home, a car stops next to them. The person driving the car asks them where the town hall is. They describe the address but the driver seems fussy. They wonder and ask. The driver tells them that he has a very important meeting and he calculates how much time he needs to catch up, the faster he goes, the faster he can catch up. It comes to Ali's mind that the speed problems they solved in the lesson are actually real right now.

When they approach the house, Ali sees his friends outside and wants to go to them. His mother allows him to play with his friends, provided that they do not go far from the house. They start playing ball.

But Ali hits the ball hard and breaks a window of their house. His mother gets angry at this, but immediately calls a glazier and asks him to install a new glass. The glazier comes with a meter and starts measuring the width and height of the window. This reminds Ali to calculate the area they used to find the places covered by the shapes. Mathematics came up again. After the glass is installed, her mother says she will make a cake for the evening. Ali also wants to help his mother. His mother is happy about this and begins to tell Ali the materials they will use. 3 eggs, 1 liter of milk, 1/2 glass of oil, 3/4 of the glass of sugar, 2,5 glasses of flour,… Numbers and fractions with commas appeared before him again.

In the evening, when his father comes home, they eat dinner and then he takes the cake he made with his mother to his father, and he sees some papers in front of his father. His father is looking at the bills. He asks what he did with them. His father talks about the importance of making correct calculations for budget management. They start watching TV together. The news is about the weather. It is said that the air temperature in Kars is -10 degrees. Ali realizes that the subject of integers is also mentioned here.

It's time for Ali to sleep. When he goes to bed, he thinks about how true the words his mother said at the beginning of the day are, in fact, mathematics appears everywhere. When we pay a little attention, we can realize that we are always in the calculations. This situation excites Ali and he falls asleep while thinking about what will happen to him about mathematics tomorrow.

**Nurşen-Yılmaz Çebi Secondary School (Öznur AKGÜL)

**Devran-Vali Mehmet Lütfullah Bilgin Secondary School (Mine KARA)

**Talha-Çankaya Regional Boarding Secondary School(Merve AKYÜZ)

**Osman-Rıfat Argün Secondary School (Ayşegül ER)

**Sanem-Atatürk Secondary School (Gökçe OKUMULŞ)

**Hasan-Çankaya Regional Boarding Secondary School (Tuğçe CALAP)

**Arda-Nuray Tuncay Kara Science And Art Center (Gül ŞAHİN)

**Natka-Zakladni Skola V. Talicha (Jaroslava NIKLOVA)

**Gabrijel- Os Milivoj Petkovic Fecko (Svetlana ILIC)

TEAM 6

take 4 steps, you

excited

an adventure awaits

REASON OF MATHEMATICS

One day, four close friends named Sanem, Gabrijel, Nurşen and Arda set out to embark on a beautiful journey. When they came to the tour, Nurşen excitedly said:

"Guys, let's wander through the woods together," he said. Sanem:

“Oh great idea, I love walking around in the woods and discovering things,” he said, and the four friends went for a walk in the woods. Arda said:

-Friends, he says (pointing to a large tree nearby) I saw a mysterious text here.

When they approach the tree and look carefully, they see that there is an inscription on it. In this text:

-4 steps forward, an exciting adventure awaits you, they will see the text and a sign.

After taking 4 steps, Arda, Nurşen, Sanem and Gabriel see a secret door and approach it excitedly. Arda reads the inscription on the door:

-Your message: "PDWHPDWLN GLBDUL"

Your key cipher: What is the prime factor of the largest digit?

The answers to the information written above will allow you to reach the back of this door.

While Sanem, Gabrijel and Nurşen are thinking about the note with surprise, Arda realizes that it may be a Caesar's Algorithm and turns to his friends:

-Heyyy, friends! I think we can unlock the door with the Caesar Cipher method to find the password, he says. Turning to his friends, Gabrijel says, "This is the first time I've heard of this method." On the other hand, Caesar describes the encryption method:

- It is a method that helps us to find the encrypted message by shifting each letter of the word written in the message as far as the number in the key password.

Let's find our password then, Sanem excitedly says. Gabrijel excitedly answers the question by saying, "Let's find the answer to the question first." The largest prime number is 9, and the prime factor of 9 is 3. Nurşen, on the other hand, said, "Then we will shift the letters 3 forward." says. Four friends swipe the given letters to find the message "Math Realm". Arda excitedly writes the password on the lock on the door and the door opens. They explore the land of Mathematics behind the door, and after gaining a lot of knowledge about mathematics, they return home and share this information with everyone they meet.

TEAM 7

**Ayşenaz-Yılmaz Çebi Secondary School (Öznur AKGÜL)

**Derman-Vali Mehmet Lütfullah Bilgin Secondary School (Mine KARA)

**Fatmanur-Çankaya Regional Boarding Secondary School(Merve AKYÜZ)

**Berra-Rıfat Argün Secondary School (Ayşegül ER)

**Nisanur-Atatürk Secondary School (Gökçe OKUMULŞ)

**Yunus Emre-Çankaya Regional Boarding Secondary School (Tuğçe CALAP)

**Yağmur-Nuray Tuncay Kara Science And Art Center (Gül ŞAHİN)

**Lea-Zakladni Skola V. Talicha (Jaroslava NIKLOVA)

**Anastasija- Os Milivoj Petkovic Fecko (Svetlana ILIC)

MATHEMATICS IS EVERYWHERE

Once upon a time, in one of the countries, there was a girl named Masal who never liked mathematics and got bored in mathematics lessons. She would listen to the lectures, but would think, what am I going to do with this information now?

One day, in a math class, Masal raised a finger and asked. ' Teacher, you explain very well, but I don't know what math will do in our daily life, so I don't want to study at all.'

The teacher thought and said you are right. But I will ask you something. When you get home today, I want you to make enough cakes for all your friends. Then we will talk again.

Masal went home and told her mother that she had to make enough cakes for all her friends. She gave her mother a cake recipe. The recipe is for 10 people. Since the class is 30 people . She had to use 3 layers of each ingredient.

Ingredients: 3 eggs, 1.5 cups of sugar, 1 cup of oil, 1 cup of milk, 2 cups of flour, 1 packet of baking powder, 1 packet of vanilla, 3 tablespoons of cocoa, 1 teaspoon of chocolate chips.

She had a lot of fun while making fairy tale cakes and realized that she used a lot of information she learned in math class. She thought how I would do it if I did not know multiplication, division, fractions, ratio and proportion.

When Masal went to school the next day, she offered cake to her friends and gave a speech. She talked about how much they use mathematics in their daily lives, even if they are not aware of it. She said that she would study more in the mathematics lesson, make more observations and tell everyone about the benefits of mathematics and thanked her teacher.