How do we know that Ravana had 10 heads?
We know that this was spread by few idiots and this was firstly I found on a page run by the peaceful community. Then after, a person with no brain forwarded it widely without having proper knowledge.
Ravana has 10 head, Kauravas were 100 and Sahastrarjun had 1000 arms years before the invention of zero. There was number system in existence much before in all civilizations including India. But there was not zero and it’s applications.
Brahmi lipi was used widely to write Sanskrit slokas in ancient India. If you see number system in the Brahmi lipi. Here it is…
Now, if you want to write 11 in brahmi number you have to write the symbol of ten in ten digit and the symbol of one in unit digit.
Here is the number system and it’s representation in Sarada Lipi. (Zero was added in this because it Sarada Lipi was developed in 3rd century.) Similar for Devanagari script which is popularly used to write Hindi and Sanskrit.
Later on, Sridharacharya invented the operations of zero in India in 8th century.He clearly mentioned the properties of Zero.
“If zero is added to any number, the sum is the same number; if zero is subtracted from any number, the number remains unchanged; if zero is multiplied by any number, the product is zero”.
So, the conclusion is the zero was invented later than number system. The number system has existed much before and zero was not part of number system then.