Answer:
The mathematical knowledge that Fibonacci (also known as Leonardo of Pisa) gathered during his travels originated primarily in the Indian subcontinent and the Islamic world. Fibonacci traveled extensively in North Africa and the Middle East, where he came into contact with the Arabic numerals and other mathematical concepts that were being developed and used in the Islamic world.
The decimal system, which is based on the use of ten digits (0 to 9), originated in India and was transmitted to the Islamic world, where it was further developed and refined. The use of zero as a placeholder in numerical notation is also believed to have originated in India and was transmitted to the Islamic world before being adopted in Europe.
Fibonacci was particularly interested in the use of fractions and wrote extensively on the subject. The use of fractions in mathematical calculations and in trade and commerce was well-established in the Islamic world, and Fibonacci's exposure to these ideas greatly influenced his work and helped to revolutionize European economic systems.
In summary, the mathematical knowledge that Fibonacci gathered during his travels originated primarily in the Indian subcontinent and the Islamic world, where it was being developed and refined by mathematicians and scholars of the time.
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