Question

suppose the leftmost digits of two numbers are 8 and 3. can you tell which number is greater? explain.

Answer 1

You cannot tell which number is greater because you don't know how many numbers follow after 8 or 3. It all depends on how many numbers follow afterwards.
Example: 
It could be 800 or 80,000
It could be 30,000 or 300,000

~ I hope you get what I mean. If you have any more questions, I'd be happy to help!<span />