Number

For the book in the Bible, see Numbers (Bible).
A Sudoku puzzle

A number is a concept from mathematics, used to count or measure. Depending on the field of mathematics, where numbers are used, there are different definitions:

Numbers are also used for other things besides counting. Numbers are used when things are measured. Numbers are used to study how the world works. Mathematics is a way to use numbers to learn about the world and make things. The study of the rules of the natural world is called science. The work that uses numbers to make things is called engineering.

Numbering methods

Numbers for people

There are different ways of giving symbols to numbers. These methods are called number systems. The most common number system that people use is the base ten number system. The base ten number system is also called the decimal number system. The base ten number system is common because people have ten fingers and ten toes. There are 10 different symbols {0, 1, 2, 3, 4, 5, 6, 7, 8, and 9} used in the base ten number system. These ten symbols are called digits.[1]

A symbol for a number is made up of these ten digits. The position of the digits shows how big the number is. For example, the number 23 in the decimal number system really means (2 times 10) plus 3, and 101 means 1 times a hundred (=100) plus 0 times 10 (=0) plus 1 times 1 (=1).

Numbers for machines

Another number system is more common for machines. The machine number system is called the binary number system. The binary number system is also called the base two number system. There are two different symbols (0 and 1) used in the base two number system. These two symbols are called bits.[2]

A symbol for a binary number is made up of these two bit symbols. The position of the bit symbols shows how big the number is. For example, the number 10 in the binary number system really means 1 times 2 plus 0, and 101 means 1 times four (=4) plus 0 times two (=0) plus 1 times 1 (=1). The binary number 10 is the same as the decimal number 2. The binary number 101 is the same as the decimal number 5.

Other Languages
Afrikaans: Getal
Alemannisch: Zahl
አማርኛ: ቁጥር
Ænglisc: Rīm
العربية: عدد
aragonés: Numero
ܐܪܡܝܐ: ܡܢܝܢܐ
armãneashti: Numiru
অসমীয়া: সংখ্যা
asturianu: Númberu
Atikamekw: Akitasowin
Avañe'ẽ: Papaha
azərbaycanca: Ədəd
বাংলা: সংখ্যা
Bahasa Banjar: Wilangan
Bân-lâm-gú: Sò͘-ba̍k
башҡортса: Һан
беларуская: Лік
беларуская (тарашкевіца)‎: Лік
български: Число
Boarisch: Zoih
བོད་ཡིག: གྲངས་ཀ།
bosanski: Broj
brezhoneg: Niver
буряад: Тоо
català: Nombre
Чӑвашла: Хисеп
čeština: Číslo
chiShona: Nhamba
Choctaw: Hohltina
Cymraeg: Rhif
dansk: Tal
Deutsch: Zahl
डोटेली: अंका
eesti: Arv
Ελληνικά: Αριθμός
emiliàn e rumagnòl: Nómmer
English: Number
español: Número
Esperanto: Nombro
euskara: Zenbaki
فارسی: عدد
føroyskt: Tal
français: Nombre
Frysk: Getal
Fulfulde: Limle
Gaeilge: Uimhir
Gàidhlig: Àireamh
galego: Número
贛語:
хальмг: Тойг
한국어: 수 (수학)
հայերեն: Թիվ
हिन्दी: संख्या
hrvatski: Broj
Ido: Nombro
Ilokano: Numero
Bahasa Indonesia: Bilangan
interlingua: Numero
Ирон: Нымæц
isiXhosa: INANI
italiano: Numero
עברית: מספר
ಕನ್ನಡ: ಸಂಖ್ಯೆ
ქართული: რიცხვი
қазақша: Сан
Kiswahili: Namba
Kreyòl ayisyen: Nonm
kurdî: Hejmar
лакку: Аьдад
ລາວ: ຈຳນວນ
Latina: Numerus
latviešu: Skaitlis
Lëtzebuergesch: Zuel
lietuvių: Skaičius
Limburgs: Getal
Lingua Franca Nova: Numero
la .lojban.: namcu
Luganda: Ennamba
magyar: Szám
मैथिली: अंक
македонски: Број
Malagasy: Isa
മലയാളം: സംഖ്യ
मराठी: संख्या
Bahasa Melayu: Nombor
Mirandés: Númaro
မြန်မာဘာသာ: ကိန်း
Nāhuatl: Tlapōhualli
Nederlands: Getal (wiskunde)
नेपाली: अंक
नेपाल भाषा: ल्याः
日本語:
Nordfriisk: Taal
norsk: Tall
norsk nynorsk: Tal
Nouormand: Neunmétho
Novial: Nombre
occitan: Nombre
олык марий: Шотпал
oʻzbekcha/ўзбекча: Son
ਪੰਜਾਬੀ: ਅੰਕ
Pangasinan: Numero
پنجابی: نمبر
پښتو: عدد
Patois: Nomba
Plattdüütsch: Tahl
polski: Liczba
português: Número
română: Număr
Runa Simi: Yupay
русиньскый: Чісло
русский: Число
саха тыла: Ахсаан
संस्कृतम्: संख्याः
Sängö: Nömörö
Scots: Nummer
Sesotho sa Leboa: Nomoro
shqip: Numri
sicilianu: Nùmmuru
slovenščina: Število
ślůnski: Nůmera
Soomaaliga: Tiro
کوردی: ژمارە
српски / srpski: Број
srpskohrvatski / српскохрватски: Broj
Basa Sunda: Wilangan
suomi: Luku
svenska: Tal
Tagalog: Bilang
தமிழ்: எண்
Taqbaylit: Amḍan
tarandíne: Numere
татарча/tatarça: Сан
తెలుగు: సంఖ్య
ไทย: จำนวน
ትግርኛ: ቁጽሪ
тоҷикӣ: Адад
ತುಳು: ಸಂಖ್ಯೆ
Türkçe: Sayı
Türkmençe: San
українська: Число
اردو: عدد
vèneto: Nùmaro
Tiếng Việt: Số
Võro: Arv
文言:
Winaray: Ihap
吴语:
Xitsonga: Nomboro
ייִדיש: צאל
Yorùbá: Nọ́mbà
粵語:
žemaitėška: Skaitlios
中文: