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Number - online puzzles

81Watchessolved 6,233 times
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493Old Polish Banknotes (1975-1996)solved 5,901 times
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384Polish zlotysolved 5,869 times
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196Roundsolved 5,311 times
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300Telephone set in a telephone boxsolved 5,210 times
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28New Year’s composition with old clocksolved 4,805 times
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252vintage platessolved 4,290 times
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81Platesolved 4,232 times
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77Historic opera glassessolved 3,938 times
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140Symbols from packagingsolved 3,933 times
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140Symbols from packagingsolved 3,886 times
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221Dollars and eurossolved 3,736 times
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Klocka online puzzle
30Klockasolved 3,675 times
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US dollars online puzzle
600US dollarssolved 3,601 times
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Atari 65XE online puzzle
112Atari 65XEsolved 3,577 times
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Symbols from packaging online puzzle
140Symbols from packagingsolved 3,196 times
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Corks online puzzle
126Corkssolved 3,048 times
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Old compass lying on dollar bills online puzzle
117Old compass lying on dollar billssolved 3,037 times
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multiplication table online puzzle
110multiplication tablesolved 2,967 times
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Clock measuring time until New Year puzzle online from photo
294Clock measuring time until New Yearsolved 2,893 times
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Alarm clocks online puzzle
84Alarm clockssolved 2,870 times
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Symbols from packaging puzzle online from photo
165Symbols from packagingsolved 2,774 times
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Map, compass and magnifying glass puzzle online from photo
135Map, compass and magnifying glasssolved 2,506 times
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Prague Astronomical Clock online puzzle
150Prague Astronomical Clocksolved 2,479 times
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Scrabble letters puzzle online from photo
187Scrabble letterssolved 2,396 times
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Clocks puzzle online from photo
80Clockssolved 2,164 times
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Bingo puzzle online from photo
176Bingosolved 1,989 times
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Croatian kuna online puzzle
384Croatian kunasolved 1,866 times
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collage puzzle online from photo
16collagesolved 1,799 times
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Old watch faces puzzle online from photo
156Old watch facessolved 1,753 times
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map online puzzle
154mapsolved 1,741 times
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Klocka Sommarland online puzzle
16Klocka Sommarlandsolved 1,686 times
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Romanian banknotes (RON) online puzzle
630Romanian banknotes (RON)solved 1,673 times
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Updated 1-100 online puzzle
24Updated 1-100solved 1,618 times
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Cakes 3 puzzle online from photo
42Cakes 3solved 1,594 times
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Banknotes online puzzle
682Banknotessolved 1,569 times
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Jigsaw Puzzle puzzle online from photo
64Jigsaw Puzzlesolved 1,549 times
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Sudoku ... online puzzle
16Sudoku ...solved 1,531 times
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Cheerful keyboard online puzzle
192Cheerful keyboardsolved 1,449 times
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Polish banknotes online puzzle
630Polish banknotessolved 1,438 times
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Clocks ... puzzle online from photo
690Clocks ...solved 1,434 times
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Currencies of the world online puzzle
600Currencies of the worldsolved 1,432 times
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Entorno de trabajo Scratch puzzle online from photo
15Entorno de trabajo Scratchsolved 1,388 times
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Printed circuit board puzzle online from photo
88Printed circuit boardsolved 1,375 times
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Jigsaw Puzzle puzzle online from photo
112Jigsaw Puzzlesolved 1,344 times
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Euro Banknotes puzzle online from photo
345Euro Banknotessolved 1,341 times
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Merry Christmas puzzle online from photo
112Merry Christmassolved 1,281 times
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Colorful puzzle online from photo
126Colorfulsolved 1,257 times
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Online puzzle Number

Number

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. Numbers can be represented in language with number words. More universally, individual numbers can be represented by symbols, called numerals; for example, "5" is a numeral that represents the number five. As only a relatively small number of symbols can be memorized, basic numerals are commonly organized in a numeral system, which is an organized way to represent any number. The most common numeral system is the Hindu–Arabic numeral system, which allows for the representation of any number using a combination of ten fundamental numeric symbols, called digits. 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, a numeral is not clearly distinguished from the number that it represents.

In mathematics, the notion of number has been extended over the centuries to include zero (0), negative numbers, rational numbers such as one half

(

1

2

)

{\displaystyle \left({\tfrac {1}{2}}\right)}

, real numbers such as the square root of 2

(

2

)

{\displaystyle \left({\sqrt {2}}\right)}

and π, and complex numbers which extend the real numbers with a square root of −1 (and its combinations with real numbers by adding or subtracting its multiples). 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, a term which 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 often regarded as unlucky, and "a million" may signify "a lot" rather than an exact quantity. Though it is now regarded as pseudoscience, belief in a mystical significance of numbers, known as numerology, 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. In modern mathematics, number systems are considered important special examples of more general algebraic structures such as rings and fields, and the application of the term "number" is a matter of convention, without fundamental significance.