Numeració índia

La numeració índia és un sistema de numeració utilitzat actualment al subcontinent indi (que comprèn l'Índia, Pakistan, Bangladesh, Nepal i Myanmar); està basat en l'agrupació de dos decimals, en lloc dels tres decimals que s'utilitzen a la majoria de parts del món. Aquest sistema de mesura introdueix separadors entre el dígits dels nombres en els llocs adequats per agrupar en dos dígits. Per exemple, 30 milions (3 crore) de rúpies s'escriurien com Rs. 3,00,00,000, en lloc de Rs. 30,000,000.

Els termes crore i lakh són actualment d'ús generalitzat en l'anglès Indi.

La taula de sota fa servir l'escala llarga, i un bilió és equivalent a un milió de milions. A l'Índia, seguint l'antic ús britànic, es va utilitzar l'escala llarga. En l'escala curta, un bilió és equivalent a mil milions.

Hindi (transliteració) Representació Potència Escala llarga
एक (Ek) 1 100 1 (U)
दस (Dus) 10 10¹ 10 (Deu)
सौ (Sau) 100 10² 100 (Cent)
सहस्र (Sahasra) / हजार (Hazaar) 1,000 103 1.000 (Mil)
लाख (Lakh/Lac) 1,00,000 10⁵ 100.000 (Cent mil)
करोड़ (Crore) 1,00,00,000 107 10.000.000 (Deu milions)
अरब (Arab) 1,00,00,00,000 10⁹ 1.000.000.000 (Un miliard)
खरब (Kharab) 1,00,00,00,00,000 1011 100.000.000.000 (Cent miliards)
नील (Neel) 1,00,00,00,00,00,000 1013 10.000.000.000.000 (Deu bilions)
पद्म (Padma) 1,00,00,00,00,00,00,000 1015 1.000.000.000.000.000 (Un biliard)
शंख (Shankh) 1,00,00,00,00,00,00,00,000 1017 100.000.000.000.000.000 (Cent biliards)
महाशंख (Mahashankh / Ald / Udpadha) 1,00,00,00,00,00,00,00,00,000 1019 10.000.000.000.000.000.000 (Deu trilions)
(Ank / Maha Udpadha) 1,00,00,00,00,00,00,00,00,00,000 1021 1.000.000.000.000.000.000.000 (Un triliard)
(Jald / Padha) 1,00,00,00,00,00,00,00,00,00,00,000 1023 100.000.000.000.000.000.000.000 (Cent triliards)
(Madh) 1,00,00,00,00,00,00,00,00,00,00,00,000 1025 10.000.000.000.000.000.000.000.000 (Deu quadrilions)
(Paraardha) 1,00,00,00,00,00,00,00,00,00,00,00,00,000 1027 1.000.000.000.000.000.000.000.000.000 (Un quadriliard)
(Ant) 1,00,00,00,00,00,00,00,00,00,00,00,00,00,000 1029 100.000.000.000.000.000.000.000.000.000 (Cent quadriliards)
(Maha Ant) 1,00,00,00,00,00,00,00,00,00,00,00,00,00,00,000 1031 10.000.000.000.000.000.000.000.000.000.000 (Deu quintilions)
(Shisht) 1,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,000 1033 1.000.000.000.000.000.000.000.000.000.000.000 (Un quintiliard)
(Singhar) 1,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,000 1035 100.000.000.000.000.000.000.000.000.000.000.000 (Cent quintiliards)
(Maha Singhar) 1,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,000 1037 10.000.000.000.000.000.000.000.000.000.000.000.000 (Deu sextilions)
(Adant Singhar) 1,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,000 1039 1.000.000.000.000.000.000.000.000.000.000.000.000.000 (Un sextiliard)

Els nombres llistats per sobre del miliard (arab) no es fan servir habitualment, encara que padma i kharawb es fan servir de vegades en hindi. Neel, padma i shankh es troben sovint en antigues seccions de la matemàtica a l'Índia.

En lloc de dir-se els nombres més alts, és més comú fer servir lakh i crore repetidament o en combinació, dient 1 lakh crore per 1012 o un trilió.

La paraula crore (کرور [Korur] en persa) va ser utilitzada a l'Iran fins a les últimes dècades, però amb el significat de 500.000.

En singalès, un crore és anomenat kōţiya (sànscrit: कोटि / koti), i un lakh és anomenat lakshaya (sànscrit: लक्ष / laksha). En telugu, un crore és anomenat koti o కోటి i un lakh anomenat laksha లక్ష, i en tàmil un crore és anomenat kodi o கோடி i un lakh és anomenat laksham லக்ஷம். En canarès, un lakh és anomenat laksah o ಲಕ್ಷ i un crore és anomenat koti o ಕೊಟಿ.

En mandarí, es van servir lakh (洛叉; luòchā) i crore (倶胝; jùzhī).

Lakh s'ha introduït en el suahili com a "laki" i és d'ús freqüent.

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