Chances

Published November 25, 2017

Chances

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

Proportion

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

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

Negative numbers

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

Prime numbers

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

Rational numbers

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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