  We study the square root computation by Leonardo Fibonacci (or Leonardo of
Pisa) in his MSS Liber Abaci from c1202 and c1228 and De Practica Geometrie
from c1220. We annotate a translation of Liber Abaci based on transcripts from
1857 and 2020 and a translation from 2002 and a transcription of De Practica
Geometrie from 1862 and a translation from 2008. We show that Fibonacci is
demonstrating the same method for all examples in the MSS and that this method
deviates from the traditional description of the digit--by--digit method. The
description of the method used by Fibonacci is all verbal and summarized in
tables for each square root example. The manuscripts and transcription of the
Latin texts are incomplete for some of the examples and the transcription and
translation contains minor discrepancies and some of the tables are incomplete
and the missing digits are inserted.
