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# Numbers

A number is a mathematical object used to count, measure, and label. The original examples are the natural numbers 1, 2, 3, 4 and so forth. A notational symbol that represents a number is called a numeral. In addition to their use in counting and measuring, numerals are often used for labels (as with telephone numbers), for ordering (as with serial numbers), and for codes (as with ISBNs). In common usage, number may refer to a symbol, a word, or a mathematical abstraction. In mathematics, the notion of number has been extended over the centuries to include 0, negative numbers, rational numbers, real numbers such as √2 and π, and complex numbers,[ which extend the real numbers by adding a square root of −1. Calculations with numbers are done with arithmetical operations, the most familiar being addition, subtraction, multiplication, division, and exponentiation. Their study or usage is called arithmetic. The same term may also refer to number theory, the study of the properties of numbers. Besides their practical uses, numbers have cultural significance throughout the world. For example, in Western society, the number 13 is regarded as unlucky, and "a million" may signify "a lot." Though it is now regarded as pseudoscience, numerology, the belief in a mystical significance of numbers, permeated ancient and medieval thought. Numerology heavily influenced the development of Greek mathematics, stimulating the investigation of many problems in number theory which are still of interest today. During the 19th century, mathematicians began to develop many different abstractions which share certain properties of numbers and may be seen as extending the concept. Among the first were the hypercomplex numbers, which consist of various extensions or modifications of the complex number system. Today, number systems are considered important special examples of much more general categories such as rings and fields, and the application of the term "number" is a matter of convention, without fundamental significance.

### Number Four : Learning to Write Simple Handwriting Number 4 Colouring Page

About Number Four Colouring Page A negative number is a number whose value is less than zero. This number is usually written using a negative...

### Number Three : Learning to Write Simple Handwriting Number 3 Colouring Page

About Number Three Colouring Page The numbers should be distinguished from numbers that are symbols for representing numbers. The 'five' number can be represented by...

### Number Two : Learning to Write Simple Handwriting Number 2 Colouring Page

About Number Two Colouring Page The concept of fractional numbers may exist from prehistoric times. Ancient Egyptians also wrote mathematical texts that describe how to...

### Number One : Learning to Write Simple Handwriting Number 1 Colouring Page

About Number One Colouring Page A number is an abstract entity that represents a count or a size. Symbols for numbers are called numbers. In...

### Number Zero : Learning to Write Simple Handwriting Number 0 Colouring Page

About Number Zero Colouring Page 0 (zero, zero or blank) is a number and digit number used to represent the number in a number. As...

### Most Creative Numbers 0 to 10 Coulouring Pages

About Most Creative Numbers 0 to 10 Coulouring Pages Learning the numbers and counting turning into fun! From what age do children need to be exposed to numeracy...