Because they needed something to represent nothing, so came up with 0.
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The first mathematician is Arya bhatt.
The oldest known text to use a decimal 0 is an Indian document: Lokavibhâga, dated 458 AD.
decimal system and zero are the contribution of the Indians to the humanity.
The zero enables the use of place values which are fundamental to the decimal system. It allows you to differentiate between 109 and 19: the 1 in the first number represents the number of hundreds whereas in the second number the same digit represents the number of tens.
India did not invent the number system. Indian mathematicians introduced the concept of zero. This was a key development that led to our number system which is based on place-values.