Source 0.999..., Wikipedia
Source Abraham Fletcher (Wikipedia)
Source Addition (Wikipedia)
Source Albert Girard (MacTutor)
Source André Tacquet (Wikipedia)
Source Baha al-Din al-Amili (Wikipedia)
Source Bhāskara II, Biography (MacTutor History of Mathematics)
Source Brahmagupta (MacTutor)
Source Charles Étienne Louis Camus (Wikipedia)
Source Cheng Dawei (Wikipedia)
Source Christian Wurstisen (Wikipedia)
Source Christoffer Dybvad (Wikipedia)
Source Commutative Property (Wikipedia)
Source Division by Zero (Wikipedia)
Source Euclidean Division (Wikipedia)
Source Farey Sequence, from Wolfram MathWorld
Source François Barrême (Wikipedia)
Source Gilles-François de Gottignies (Wikipedia)
Source Giuseppe Maria Figatelli (Wikipedia)
Source Wikipedia: Henry Briggs
Source Jean-Joseph Rallier des Ourmes (Wikipedia)
Source Jerónimo Cortés (Wikipedia)
Source Joan Francés Fulcònis (Wikipedia)
Source Johann Lantz (Wikipedia)
Source John Collins (mathematician) (Wikipedia)
Source John Colson (Wikipedia)
Source Jonas Moore (Wikipedia)
Source Juan Caramuel y Lobkowitz (Wikipedia)
Source Leonty Magnitsky (Wikipedia)
Source Lowest Common Denominator (Wikipedia)
Source Luca Pacioli, Biography (MacTutor History of Mathematics)
Source María Andrea Casamayor (Wikipedia)
Source Wolfram MathWorld: Midy's Theorem
Source Mihalj Šilobod Bolšić (Wikipedia)
Source Wolfram MathWorld: Minus Sign
Source Number (Wikipedia)
Source Pedro Chacón (Wikipedia)
Source Pietro De Martino (Wikipedia)
Source Wolfram MathWorld: Radix
Source Robert Recorde (MacTutor)
Source Sigismundus Suevus (Wikipedia)
Source Simon Stevin, Biography (MacTutor History of Mathematics)
Source Successor Function (Wikipedia)
Source Thomas Harriot (Wikipedia)
Source Yoshida Mitsuyoshi (Wikipedia)