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The Indian mathematician who formally introduced ZERO as a number (with rules for arithmetic) in 628 CE was:

AAryabhata
BBrahmagupta
CBhaskara
DMadhava
Answer & Solution
Correct answer: B. Brahmagupta
Brahmagupta's Brāhmasphuṭasiddhānta (628 CE) gave zero its first formal definition and rules — not just a placeholder, but a number you could add, subtract, multiply with. The philosophical idea of śhūnya was much older (Yoga Sutras, c. 3rd century BCE), but Brahmagupta codified it for mathematics.
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