 When this character was typeset, it was convenient to use the existing comma (99,95) or full stop (99.95) instead.Positional decimal fractions appear for the first time in a book by the Arab mathematician Abu'l-Hasan al-Uqlidisi written in the 10th century.The practice is ultimately derived from the decimal Hindu-Arabic numeral system used in Indian mathematics and popularized by the Persian mathematician Al-Khwarizmi, when Latin translation of his work on the Indian numerals introduced the decimal positional number system to the Western world.