IF you want 100 to fifth power then I suspect most mathematicians would just write it like this.
100^5.
The 5 denotes the power and would written as a a superscript. I have tried replicating that here but the text buttons above are not working for me.
However 100 is itself 10^2. So it would be better to write it as ((10^2)^5) This is where to evaluate it you now multiply the indices and so your answer is 10^10. If you want to expand that then 10^10 is one followed by 10 zeroes. That number has a name and is a billion. Hope this helps.