Learning Process | Think Outside the Box

What limitations were you given for this exercise? - None.

So, why didn't you think to add more digits or to replace the given arithmetic operations?

Welcome to the hacker's way of thinking called:

"Outside the box." 

So, why didn't we think like that? During this learning path, we will acquire more information that will help us find an answer. However, first, we have to understand the way of thinking we currently use. Make it clearer. Try to understand what we have to work on.