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Signs of multiplication and division played a huge role in the development of mathematics. The sign of the "oblique cross" multiplication (x) was first introduced by the English mathematician William Ouartred (1575-1660). The multiplication by a column, familiar to us from the school bench, is an invention not so far away! (His also invented Oudred.) His disciples were the famous Christopher Wren - the creator...

Extracting of the cubic root - it's easy! If you tell a friend that you can count in your mind no worse than electronic computer, he, of course, will ridicule you. Then, without embarrassment, ask him to erect in a cube a number not more than a hundred. When he tells you the result, for example, the number 658503...

Experiments with numbers, surprising combinations of numbers and the result obtained in the aftermath of these actions sometimes cause admiration. Amazing numerical pyramids and amazing properties of numbers can be seen...

Opening logarithms was based on the well-known by the end of the 16th century. properties of progressions. Many mathematicians noticed that in addition, subtraction, multiplication and division, arithmetic progression (in the same order) corresponds to multiplication, division, exponentiation, and extraction of a root in a geometric progression...

When the hot summer days come, it's hard to stay at home. It's time to collect things and get ready for rest. The best rest is a hike, or excursions, during which one often has to measure distances. But the dimensional ruler or tape is not always at hand, and it is useful to be able to manage somehow without them, producing at least approximate measurements...

In our time of rapidly developing technologies it is difficult to surprise a person with anything unusual. Therefore, we sometimes do not pay attention to the world around us, which since ancient times "inhabit" numerical giants. They are present everywhere and even inside ourselves - we only need to be able to examine them...