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Pomoc od bezmoci z odmocnin
Učitel matematiky, Tome 23 (2015) no. 1, pp. 35-44
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Calculation of the square root of natural numbers used to be a part of mathematics taught at elementary schools. However nowadays, we prefer calculators to our heads and the simple algorithm for square roots has been almost forgotten. The aim of this article is therefore to revive this art and moreover to show three methods: school-wise, Chinese and Indian. Before we recall the algorithms, try to invent your own way of calculation of square roots!
Calculation of the square root of natural numbers used to be a part of mathematics taught at elementary schools. However nowadays, we prefer calculators to our heads and the simple algorithm for square roots has been almost forgotten. The aim of this article is therefore to revive this art and moreover to show three methods: school-wise, Chinese and Indian. Before we recall the algorithms, try to invent your own way of calculation of square roots! 
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Dvořáková, Ľubomíra; Škarda, Čeněk. Pomoc od bezmoci z odmocnin. Učitel matematiky, Tome 23 (2015) no. 1, pp. 35-44. http://geodesic.mathdoc.fr/item/UM_2015_23_1_a3/

[1] Bailey, D. H., Borwein, J. M.: Ancient Indian Square Roots: An Exercise in Forensic Paleo-Mathematics. anuscript, 2011, dostupné na http://www.davidhbailey.com/dhbpapers/india-sqrt.pdf | MR

[2] Juškevič, A. P.: Dějiny matematiky ve středověku. 1. vydání, Academia, Praha 1978. | MR

[3] Parakh, A.: Aryabhata's Root Extraction Methods. Indian Journal of History of Science 42.2 (2007), 149-161. | MR

[4] Wang, L., Needham, J.: Horner's Method in Chinese Mathematics: Its Origin in the Root-Extraction Procedures of Han Dynasty. T'Oung Pao 43(5) (1955), 345-401. | DOI

[5] Škarda Č.: Aritmetika včera a dnes. (www stránka s popisy algoritmů základních aritmetických operací), http://bimbo.fjfi.cvut.cz/~soc