At the beginning of the 20th century, the German professor Felix Klein wrote a valuable book for teachers, the title of which translates as “Elementary Mathematics from a Higher Point of View. In our country, however, this title was mistranslated: “Elementary Mathematics from a Higher Point of View,” which gave rise to the term we still use today, “Higher Mathematics. That is, in fact, this mathematics is not higher mathematics at all, but elementary.

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The first "computing devices" were fingers and pebbles. Later came notches and ropes with knots. In ancient Egypt and Ancient Greece, long before Christ, they used the abacus, a board with strips on which pebbles were advanced. This was the first device specifically designed for calculations. Over time, the abacus was perfected by moving pebbles or balls along grooves in the Roman abacus. The abacus survived until the 18th century, when it was replaced by written calculations. Russian abacus - accounts appeared in XVI century. The great advantage of the Russian abacus is that it is based on the decimal system of notation, as all other abacus.
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- Among all figures with the same perimeter, the circle will have the largest area. But among all figures with the same area, a circle will have the smallest perimeter.
- In mathematics there are: game theory, the theory of squares, and the theory of knots.
- A cake can be divided by 3 taps of a knife into eight equal pieces. Moreover, there are 2 ways.
- 2 and 5 are the only prime numbers that end in 2 and 5.
- Zero cannot be written in Roman numerals.
- The equal sign “=” was first used by Robert Record in 1557.
- The sum of the numbers from 1 to 100 is 5050.
- Since 1995 in Taipei, Taiwan, it has been allowed to delete the number 4, because in Chinese the number sounds identical to the word “death”. Many buildings do not have a fourth floor.
- A blink is a unit of time that lasts for about a hundredth of a second.
- Thirteen is believed to have become an unlucky number because of the Last Supper, at which 13 people were present, including Jesus. The thirteenth was Judas Iscariot.
- Charles Lutwidge Dodgson was a little-known British mathematician who devoted most of his life to logic. Despite this, he is a world-famous writer under the pen name Lewis Carroll.
- The first woman mathematician is considered to be the Greek woman Hypatia, who lived in Egyptian Alexandria in the IV-V centuries AD.
- The number 18, is the only number (other than zero) whose sum of digits is twice less than itself.
- George Danzig, an American student, was late for class, which caused him to mistake the equations written on the board for his homework. He struggled, but he got through them. As it turned out, these were two “unsolvable” problems in statistics that scientists had been struggling to solve for years.
- The modern genius and mathematics professor Stephen Hawking claims to have studied mathematics only in school. When he taught mathematics at Oxford, he simply read the textbook a couple of weeks ahead of his own students.
- In 1992, Australian like-minded people banded together to win the lottery. There was $27 million at stake. The number of combinations of 6 out of 44, was just over 7 million, with a lottery ticket costing $1. These like-minded people created a fund in which each of the 2,500 people invested $3,000. The result was a win and a return of $9,000 each.
- Sofia Kovalevskaya first learned about mathematics as a child, when instead of wallpaper on the wall of her room were pasted sheets with lectures by a mathematician on differential and integral calculus. For the sake of science she arranged a fictitious marriage. In Russia, women were forbidden to pursue science. Her father was against his daughter going abroad. The only way was marriage. But later the sham marriage became a de facto marriage and Sophia even gave birth to a daughter.
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- The British mathematician Abraham de Moivre discovered in his old age that he slept 15 minutes more each day. He made an arithmetic progression, by which he determined the date when he would sleep 24 hours a day – it was November 27, 1754 – the date of his death.