How do I use scientific notation to write 15,800?
Please check my answer to this question, especially my preliminary discussion.
The one we need for this problem is to reverse the process.
Think of 15,800 as
Since we are reversing the process, moving the decimal place to the left will increase
We want to reduce 15800 to single digits. Hence, we need to move the decimal place 4 places to the left. Correspondingly, we need to increase
So, we have