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Fibonacci's accomplishments were the creation of the Fibonacci number sequence and he also was responsible for the spreading of the Hindu-Arabic numbering system.
were did Fibonacci learn about the Hindu-Arabic numeral system
The Dewey Decimal System, is a library classification system first published in the United States in 1876. It is currently maintained by the Online Computer Library Center (OCLC), a non-profit cooperative that serves libraries.
Fibonacci believed that Arabic numerals were simpler and more efficient than Roman numerals. He is most well known today for the sequence 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, etc., known as the Fibonacci scale. He helped introduce Indo-Arabic numerals into Europe, including zero and place notation.
Yes, Americans DO use the Arabic numeral system, although the proper term is the Hindu-Arabic Numeral System, since the Hindus were using a decimal system in 900 CE. In 1202 CE, Fibonacci (Leonardo of Pisa) translated this system from Hindu to Latin. This system is now used worldwide.