Which Indian Mathematician Invented Decimal Place Value?
Option 4 is the right answer.
Aryabhata was the first of the major mathematician-astronomers from the classical age of Indian mathematics and Indian astronomy. His works include the Aryabhaṭiya (499 CE, when he was 23 years old) and the Arya-siddhanta.
Aryabhata’s major work in science and math are following
Invention of zero
Place value system
Sidereal rotation of Earth
Value of Pi ( π )