## Chances

Published November 25, 2017

The mathematical essence of any lottery is chances. So, for example, if an organization sold 1745 charitable tickets, numbered from 1 to 1745, and only one prize is put to the drawing, the chances for this prize from a person who bought only 1 ticket will be 1,745 to 1. If a person buys 5 tickets, his chances are 1745 to 5, i.e. 349 to 1...

## Proportion

Published November 25, 2017

A sheet of A4 paper is usually made in the size 21x29,5 cm. And why? In fact, a sheet of this size is the "canon", the proportion of many numbers, open to Leonardo da Vinci. It has an amazing property: if you fold a sheet of paper of the size mentioned above twice, the length will become the width and the proportion will remain the same...

## Natural numbers

Published November 25, 2017

Natural numbers arise naturally when counting objects: 1, 2, 3... Natural because they were designated (modeled) by real undivided objects: people, animals, things... The notion of a natural number arose, as we have seen, back in prehistoric times. They have two main functions: the first - the characteristics of the number of objects, and the second...

## Negative numbers

Published November 25, 2017

It is known from history that negative numbers did not enjoy popularity among people: they were incomprehensible. Here with a positive number everything is always clear! Positive numbers have long been treated as "profits", and negative numbers - as "debts", "loss": who will it be nice? Only in Ancient India and China guessed instead of the words "debt of 10 yuan" write simply...

## Prime numbers

Published November 25, 2017

Numbers that only divide by themselves, for example 7, 11, 13 - prime numbers. People have noticed long ago that numbers come in two different varieties. For example, number 12 can be divided without a remainder on 2, 3, 4 and 6. And the next number 13 is divided by itself: 13/13 = 1. In addition, each number is divided into one. Numbers such as 12 or 15, which can be divided into some other...

## Rational numbers

Published November 25, 2017

Ancient Greek mathematicians of the classical era used only integer and fractional positive numbers. These are the so-called rational numbers. Fractions and operations on them were used, for example, by Sumerians, ancient Egyptians and Greeks. In ancient Greece, rational numbers in general were a symbol of the harmony of the surrounding world and a manifestation of the divine principle...

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