Book (Practical) Mathematics It can be proven by mathematics. - 20 mysteries of mathematics that are too interesting in our daily lives -

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Mathematics
The number of registered users is 180000! The popular YouTube channel "Nasotoki Lab" is made into a book for the first time! From the popular posts, we carefully select themes that even beginners can enjoy, and put them into one book with the addition of handwritten notes. ・ What is the structure of the 4-dimensional pocket? ・ How many times do you feel in your life in 500 million? ・ Why is the right angle 90 degrees? ・ Why is the bee's nest a hexagon? ・ If 0 doesn't exist in this world? It is fun to explain the mysteries of mathematics hidden in everyday life with illustrations and illustrations. It is also good for logic training! ◆ Audience : Elementary school students who like mathematics - Adults who are not good at mathematics [CONTENTS] Q1 How do you know if you can write a single stroke? Q2 How many times do you feel in your life? ・ Why is the right angle 90 degrees? ・ Why is the bee's nest a hexagon? ・ Why is the bee's nest a hexagon? ・ Why is the right angle 90 degrees? Q5 Don't be fooled by the average! Q6 Voting Paradox Q7 Who has the same number of hair? Q8 Why is the bee's nest a hexagon? Q9 Exactly 50 times out? Q10 How do you toss with a distorted coin? Q 110 is not used? Q 122 is not in the world? Q13 Infinite Hotel Paradox Q14 If 0 doesn't exist in this world, dividing by Q15 0 causes the world to collapse? Q18 How do you paint an infinite plate? Q19A survives? Q20 What is the structure of the 4-dimensional pocket? [Author PROFILE] Kitagawa 郁馬 Ikuuma Kitagawa The YouTube channel "Nasotoki Lab [IQ & Solving Channel]" started in May 2017. The theme is "Anyone," "For all ages" and "Interesting". They mainly produce videos on mathematics, IQ tests, and solving problems. YouTube Nasotoki Lab [IQ & Solving Channel] "Anyone," "Anyone," "Anyone 0 KUJI