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Solution


We all use zero at many places such as for Ten, we write One followed by zero.
But we haven't thought that why we only use zero for Ten or Twenty etc.

Let's take an example,
Suppose we are counting mangoes and when Ten comes, we put a symbol,
And similarly for Twenty another symbol, for Thirty again another symbol and like wise.
Now you know that numbers are infinite and we have to remeber infinite symbols, If we follow this method
And that is not possible for a human mind.

This is the situation where we need an easy method to write the numbers,
And here zero is introduced.

Now imagine the same mangoes we are counting and when Ten comes this time, we use One followed by Zero(10).
We repeat the trick for all other numbers like Twenty(20), Thirty(30) etc.
Whatever number comes, we just need to write that number and put Zero after that.
This method is very simple and yet easy to remember also and here we don't need to remember infinite symbols.