prolog

Part 1.
Math jokes that even elementary school students can understand

On the topic of addition / Heo Gak's Chicken / Four, two, three, two / Dotted line, square / Wish / Miracle / Even and odd numbers / How old are you? / Tips / Debate / Units / Mental arithmetic king / Price list / Corner / Levitation / Answer sheet / 10 won / Snowman / 12:30 / Amazing / Putin / Protractor / Mind reading / Orbit / Hero
- Appendix 1.
Is there a law that says you can't divide by 0?

Part 2.
Math jokes like a whirlwind

Braces / Double / Shattered / Sequence / Motivation / XXXXX / Something new / Math class I / Textbook / Math class II / Error I / Factoring I / Factoring II / Blind date I / Blind date II / Face / Subway / Mirror / Trap card / Pizza / Inconvenience / Depression / Help me / Clock / Funny story I / Picture / Spy / Binary / Error II / Quadratic formula / Running Man / Worries / Glass / Proof / Square number / Basket / Letters and numbers / Error / Take a guess
- Appendix 2.
Trigonometry is everywhere

Part 3.
Uncontrollable Math Jokes

Addition / Choco Pie I / Choco Pie II / Exclamation mark / 4! / About 3 / Scarecrow / VANS / Funny story II / Fill in the blank / Log / Set / Inverse function / Odd function / Real number / Snail / Palm / Trigonometry / Sun / 1 / Speed ​​/ Laptop / Freshman / Canned food / Stairs / Funny meme I / Funny story I / Constant of integration I / Constant of integration II / Weakness / Funny meme II / Touching / Error III / Probability / Confession I / Confession II / Boa constrictor / Correct answer / Think / Take / Pi / Challenge / Minor difference / More, less / Inequality / Bookstore / Error IV / Lake / Isn't it 9?
- Appendix 3.
An irrational number is an irrational number, so is it an irrational number?

Part 4.
High-difficulty math jokes

Amulet / Same / Game / You Hold It I / Funny Story III / Conversation / Buddha / Funny Story IV / Harry Potter / NO / Iceberg / The Length of the Line / Interference / Sacrifice / Quiz / Test / Street Trees / Listen Carefully / Choose / Beauty Salon / Flat Earth / Duality / Easy, Right? / Delivery / Eye Test / Irrational Number / Difficult Problem / You Hold It II
- Appendix 4.
Differentiation and integration are nothing special

Joke commentary

“I know the most perfect math joke,
“I won’t write this down because there is not enough space.”

A math YouTuber with 120,000 subscribers and 13 million cumulative views.
A fantastic feast of jokes and math, guided by Lee Sang-yeop Math!

What happens when dry jokes and dry, boring math meet? When people think of math, they think of games with numbers and formulas, problems with definitive answers, ingenious and quick solutions, and a cold, grading system that determines whether an answer is right or wrong.
However, math YouTuber Lee Sang-yeop says that this aspect of mathematics is just one of the countless diverse aspects of mathematics.
On one hand, there is mathematics that is confined to the framework of textbooks and specialized teaching materials encountered in school, and on the other hand, there is mathematics that is pure, mischievous, and infinitely free, like a mischievous child.
On the one hand, there is mathematics as a stepping stone for learning other disciplines and skills, while on the other hand, there is mathematics as an end in itself, an object of play and exploration.

For many people, mathematics remains a boring set of rules, formulas, and problem-solving that they had to follow because they couldn't understand it during their school days.
How can we show these people that mathematics has a new, freeing, and joyful side they never knew existed? "Most Real Numbers Are Irrational" is a delightful math book filled with humorous math jokes, memes, jokes, short stories, and wordplay, designed to help readers fully experience the joy of mathematics and cultivate their curiosity.
Illustrator Lee Sol has redrawn the jokes collected and created by math YouTuber Lee Sang-yeop.

I was once asked this question.
“If mathematicians take the CSAT, they’ll all get perfect scores, right?”
“Just because I’m a veteran taxi driver with 30 years of accident-free experience doesn’t mean I’m good at KartRider.”

"Most Real Numbers Are Irrational" contains 140 jokes covering various fields, levels of difficulty, and formats of mathematics.
Some jokes are one-dimensional puns that can be understood the moment you see them.
The joke, “Why do you have to go to the corner when it’s cold? Because the corner is 90 degrees!” is a pun based on the fact that the unit of angle, “degree,” and the unit of temperature, “degree,” are pronounced the same.
“What is the probability of getting this question right when you try to guess it? 1.
20% 2.
30% 3.
25% 4.
20% 5.
The joke “50%” is one that requires careful consideration of the options and a little calculation to understand what it means.

This book contains easy jokes that can be understood with just an elementary school level knowledge of arithmetic, but it also covers more difficult jokes that require knowledge of advanced mathematics such as calculus, topology, and infinity.
But you don't need to be familiar with mathematical concepts to understand these jokes.
The "hair salon" joke, which is also included on the cover, is truly funny if you know the concept of polar coordinates, but even if you don't know the concept of polar coordinates, you can still laugh at the situation where you ask the hair salon to cut your hair in the shape of a mathematical graph.

If you are a math enthusiast who wants to test your math 'virtuosity',
If you are a student who is tired of studying math and wants to cool your head,
You must read this book.

What's important is what comes next.
Math jokes are funny even if you don't necessarily understand them, but they're funnier once you do.
Math jokes and memes are an invitation to pique the reader's curiosity about mathematics and lead them deeper into the realm of mathematics.
As author Lee Sang-yeop says, mathematics is a discipline that “starts with a question mark, moves toward a period, but ultimately reaches another question mark.”
No one can predict where the mathematical journey that begins with the first question that comes to mind after reading a math joke will lead the reader.


"Most Real Numbers Are Irrational" is divided into four parts, starting with Part 1, which covers elementary school-level math jokes, and gradually increasing in difficulty until Part 4 covers college-level math jokes.
Between each section, background knowledge such as 'division by zero', 'trigonometric functions', 'number systems (irrational numbers, real numbers, etc.)', and 'calculus', which frequently appear in math jokes, are explained through webtoon-style comics.
For readers who are curious about the mathematical knowledge behind the math jokes, a 'joke explanation' is included at the end of the text.
If you are a math enthusiast who wants to test your math skills, or a student who is tired of studying math and wants to cool off, this book is a must-read.
Enjoy these 140 math jokes that will stimulate your brain's math cells and you'll find yourself falling in love with math before you know it.