T: sure, if you want to. But let me ask you something. If you were building a house on the top of a mountain, how would you get the materials up to the building site?
S: A truck.
S2: A helicopter!
T: You wouldn't carry it. Would you?
S: No (mocking laughter)
T: Oh, so you would use a tool to make your life easier. Isn't that what a calculator is?
S: I guess so. I'm still doing it by hand, calculators are cheating.
(note: S eventually gave up and used a calculator)