Answer:
Fibonacci introduced Arabic numerals to Italy, which helped make bookkeeping possible.
Step-by-step explanation:
Leonardo Fibonacci took his first maths lessons from an Arabic teacher in the city of Bouzia, now Algerian. He traveled a lot with his father first, then alone, visiting and studying in places such as Egypt, Syria, Provence, Greece and Sicily. During his travels around Europe and the countries of the East, he had the opportunity to learn about the achievements of Arab and Hindu mathematicians, including the decimal number system. Around 1200, Fibonacci ended his journey and returned to Pisa. Once in Europe, he introduced Arabic numerals in the continent.