Answer:
I think that it is fine to go through my math or science classes without a calculator. How is using my calculator for a crunch just in case I got something wrong? I have found that if I didn't have a calculator I would be fine but if I have it I will use it. It is also a lazy thing. Instead of spending time to calculator what 136x45 is I could just find it in a second. But other than that it is ok.