Presumably, the intended usage scenario is when the student does not have access to the answer of the problem from a different source, like the back of the book

Presumably, the intended usage scenario is when the student does not have access to the answer of the problem from a different source, like the back of the book. In that case, I would submit that being given the correct answer to a calculation helps the student FAR more than being forced to estimate it. Suppose you are studying math, and come upon a question to which you don't know the answer. Which better helps you to understand, starting from "I need to figure out how to do this" or "I need to figure out why the answer is 0.0001."? Further, this has little to no application in the real world classroom. For tests in which calculators would simply give the student the answer, students are simply not allowed to use calculators at all. I would argue that, in an exam environment, there is effectively no margin between "a normal calculator would be cheating so you have to use paper" and "this has multiple steps such that a simple calculator will not give you the right answer without understanding." In light of the existence of pen and paper, and simple 8-digit calculators, this product addresses a problem that simply doesn't exist.