Book (Practical) Mathematics Everyday life is full of numbers Math that I want to keep solving

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Mathematics
If you look at it, the world will change! If you look at it, you will know the answer! Full of everyday mysteries to solve mathematics! Can you solve 1 question in 5 minutes? Let's challenge! Akiki Yokoyama, Waseda University Graduate School of Mathematics and Applied Mathematics, President of Math Channel Co., Ltd. and Vice President of the Japan Society of Comic Mathematics, who teaches the pleasure of mathematics and mathematics in a wide range of ages and adults. Representative of Math Channel Co., Ltd. and Vice President of the Japan Society of Comic Mathematics, who teaches the pleasure of mathematics and mathematics. A senior instructor certified by the Japan Society for Mathematical Examination. Ten books including 『's Smiling Mathematics 』 (KADOKAWA) and 『's Math King Puzzle 』 (Shogakukan). The latest books are 『's Smiling Mathematics Route 4 』 (KADOKAWA), and 『's Mathematics 』 (Seishun Publishing), which is also popular with