In 77 1 year, mathematicians from northern India were captured in Baghdad, Arabia, and forced to teach local people new mathematical symbols and systems, as well as Indian-style calculation methods (that is, the calculation methods we use now). Because Indian numerals and Indian counting methods are simple and convenient, their advantages far exceed other calculation methods. Arab scholars are willing to learn these advanced knowledge, and businessmen are willing to do business in this way.
Later, Arabs introduced this figure to Spain. In 10 century, it was spread to other European countries by Pope Gelber Auriac. Around 1200, European scholars formally adopted these symbols and systems. In the13rd century, at the initiative of Fibonacci, a mathematician in Pisa, Italy, ordinary Europeans also began to adopt Arabic numerals, which was quite common in the15th century. At that time, the shape of Arabic numerals was not exactly the same as that of modern Arabic numerals, but they were relatively close. Many mathematicians have spent a lot of effort to make them become the writing methods of 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 today.
Arabic numerals originated in India, but spread to all directions through Arabs, which is why they were later called Arabic numerals.