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The number system we use as in 1, 2, 3, 4, 5, 6, etc.... is descended from the Hindu-Arabic Number System, although there are still some minor differences, that's where it comes from. Primarily Western Arabic Numerals.
If you had 2 apples and I gave you 4 apples what would be the number of apples you then had.
Bhāskara was a 7th century Indian mathematician, who was apparently the first to write numbers in the Hindu-Arabic decimal system with a circle for the zero, and who gave a unique and remarkable rational approximation of the sine function in his commentary on Aryabhata's work.
He gave the Pythagorean Theorem to the world.
In 1990, you gave the answer in your question.