1 divided by 5 times 10 to the power of 9

 200000000 is the answer is that enough work melody!!!!shesh

Yes that is much better zegroes,

If you use the math(input=result) button you get

$${\frac{{\mathtt{1}}}{{\mathtt{5}}}}{\mathtt{\,\times\,}}{{\mathtt{10}}}^{{\mathtt{9}}} = {\mathtt{200\,000\,000}}$$

Actually I think your answer is probably better!

i dont know how to use that......

It is easy to use.

Just click on it and then type in your question like you would an ordinary calculator the working and the answer will apear at the bottom of the screen and if you are happy press ok.

It's simple - have a play with it.