About the book: 2014 / A small but very inquisitive resident of the land of numbers, Nulik invites you on an exciting journey through the world of the most precise of sciences! You have to spend three bright days in the arithmetic state of Dwarf, uncover the secret of the Black Mask from Al-Jebra and become, like Nulik, real sailors while sailing through the geometric seas and oceans. Simple and decimal fractions, negative numbers, degrees and equations, volumes of bodies and areas of figures - all this and much more becomes the heroes of the books by V. Levshin and Em. Alexandrova is understandable and incredibly fascinating, giving rise to genuine interest in the mathematical sciences. Artist Natalya Isaicheva.