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Indian numbering system - Wikipedia

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Indian convention of naming large numbers

The Indian numbering system is used in India, Pakistan,Nepal,Srilanka, and Bangladesh to express large numbers, which differs from the International System of Units. Commonly used quantities include lakh (one hundred thousand) and crore (ten million) – written as 100,000 and 10,000,000 respectively in some locales.^[1] For example: 150,000 rupees is "1.5 lakh rupees" which can be written as "1,50,000 rupees", and 30,000,000 (thirty million) rupees is referred to as "3 crore rupees" which can be written as "3,00,00,000 rupees".

There are names for numbers larger than crore, but they are less commonly used. These include arab (100 crore, 10⁹), kharab (100 arab, 10¹¹), nil or sometimes transliterated as neel (100 kharab, 10¹³), padma (100 nil, 10¹⁵), shankh (100 padma, 10¹⁷), and mahashankh (100 shankh, 10¹⁹). In common parlance (though inconsistent), the lakh and crore terminology repeats for larger numbers. Thus lakh crore is 10¹².

In the ancient Indian system, still in use in regional languages of India, there are words for (10⁶²). These names respectively starting at 1000 are sahasra, ayuta, laksha, niyuta, koti, arbhudha, abhja, karva, nikarva, mahapadma, shanmkhu, jaladhi, amtya, madhya, paraardha. In the Indian system, now prevalent in the northern parts,^{[clarification needed]} the next powers of ten are one lakh, ten lakh, one crore, ten crore, one arab (or one hundred crore), and so on.

The Indian system is decimal (base-10), same as in the International System of Units, and the first five orders of magnitude are named in a similar way: one (10⁰), ten (10¹), one hundred (10²), one thousand (10³), and ten thousand (10⁴). For higher powers of ten, naming diverges. The Indian system uses names for every second power of ten: lakh (10⁵), crore (10⁷), arab (10⁹), kharab (10¹¹), etc. In the rest of the world, long and short scales, there are names for every third power of ten. The short scale uses million (10⁶), billion (10⁹), trillion (10¹²), etc.

The Indian system groups digits of a large decimal representation differently than the International System of Units. The Indian system does group the first three digits to the left of the decimal point. But thereafter, groups by two digits to align with the naming of quantities at multiples of 100.^[2]

Like English and other locales, the Indian system uses a period as the decimal separator and the comma for grouping, while others use a comma for decimal separator and a thin space or point to group digits.^[3]

When speakers of indigenous Indian languages are speaking English, the pronunciations may be closer to their mother tongue; e.g. "lakh" and "crore" might be pronounced /lɑkʰ/, /kɑrɔːr/, respectively.

• lakh /lɑːkʰ/
• crore /kɹɔːɹ/ (or /kɹoʊɹ/ in American English)
• arab /ʌˈɾʌb/
• kharab /kʰʌˈɾʌb/

The table below includes the spelling and pronunciation of numbers in various Indian languages along with corresponding short scale names.

(bongo)দশ হাজার লাখ কোটি
(dôś hāzār lākh kōṭi)

(mohabongo)শত হাজার লাখ কোটি
(śoto hāzār lākh kōṭi)

There are various systems of numeration found in various ancient epic literature of India (itihasas). The following table gives one such system used in the Valmiki Ramayana.^[4]

The denominations by which land was measured in the Kumaon Kingdom were based on arable lands and thus followed an approximate system with local variations. The most common of these was a vigesimal (base-20) numbering system with the main denomination called a bisi (see Hindustani number bīs), which corresponded to the land required to sow 20 nalis of seed. Consequently, its actual land measure varied based on the quality of the soil.^[5] This system became the established norm in Kumaon by 1891.^[6]

Below is a list of translations for the words lakh and crore in other languages spoken in the Indian subcontinent:

• In Assamese, a lakh is also called লক্ষ lokhyo, or লাখ lakh and a crore is called কৌটি বা কোটি kouti
• In Bengali, a lakh is natively (tadbhava) known as লাখ lākh, though some use the ardha-tatsama লক্ষ lokkho. A crore is called কোটি kōṭi
• In Burmese, crore is called ကုဋေ [ɡədè]. Lakh is used in Burmese English.
• In Dhivehi, a lakh is called ލައްކަ la'kha and a crore is called ކްރޯރް kroaru
• In Gujarati, a lakh is called લાખ lākh and a crore is called કરોડ karoḍ. A hundred crore is called અબજ abaj
• In Hindi, a lakh is called लाख lākh and a crore is called करोड karoḍ. A hundred crore is called अरब arab
• In Kannada, a lakh is called ಲಕ್ಷ lakṣha and a crore is called ಕೋಟಿ kōṭi
• In Khasi, a lakh is called lak and a crore is called klur or krur. A billion is called arab and hundred billion is called kharab.
• In Malayalam, a lakh is called ലക്ഷം laksham and a crore is called കോടി kodi.
• In Marathi, a lakh is called लाख/लक्ष lākh and a crore is called कोटी koṭi or करोड karoḍ, and an arab (10⁹) is called अब्ज abja.
• In Nepali, a lakh is called लाख lākh and a crore is called करोड karoḍ.
• In Odia, a lakh is called ଲକ୍ଷ lôkhyô and a crore is called କୋଟି koṭi.
• In Punjabi, a lakh is called lakkh (Shahmukhi: لکھ, Gurmukhi: ਲੱਖ) and a crore is called karoṛ (Shahmukhi: کروڑ, Gurmukhi: ਕਰੋੜ).
• In Rohingya, a lakh is called lák and a crore is called kurul. A thousand crore is called kuthí.
• In Sinhala, a lakh is called ලක්ෂ lakṣa and a crore is called කෝටි kōṭi.
• In Tamil, a lakh is called இலட்சம் ilaṭcam and a crore is called கோடி kōṭi.
• In Telugu, a lakh is called లక్ష lakṣha and a crore is called కోటి kōṭi.
• In Urdu, a lakh is called لاکھ lākh and a crore is called کروڑ karoṛ. A billion is called arab (ارب), and one hundred billion/arab is called a kharab (کھرب).
• Lakh has entered the Swahili language as "laki" and is in common use.

Formal written publications in English in India tend to use lakh/crore for Indian currency and International numbering for foreign currencies.^[7]

The official usage of this system is limited to the nations of India, Pakistan and Bangladesh. It is universally employed within these countries, and is preferred to the International numbering system.^[8]

Sri Lanka and Nepal used this system in the past but has switched to the International numbering system in recent years. In the Maldives, the term lakh is widely used in official documents and local speech. However, the International System of Units is preferred for higher denominations (such as millions).

Most institutions and citizens in India use the Indian number system. The Reserve Bank of India was noted as a rare exception in 2015,^[9] whereas by 2024 the Indian system was used for amounts in rupees and the International system for foreign currencies throughout the Reserve Bank's website.^[10]

• Scientific notation
• Japanese notation

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