I personally think teachers are placing too much into trust into the calculator. hey I started on a slide rule because it taught me that there is more than one way to skin a cat. Not that I promote skinning cats or using slide rules instead of calculators, but knowing how the damn thing works can really do a hell of a lot in how one uses their technology. Calculators are easy and work most of the time. If teachers really wanted to be jerks they could give problems that involve lots of work and have the student show their process. Write out each step and explain it, thus showing an understanding of the material and a certain comfort level with it. Instead of training them to automatically punch every problem into a piece of software spit out an answer.