Enthusiasm for the use of calculators in the learning of mathematics is misplaced  Teachers rightly observe that in some cases calculators enable students to focus on general principles rather than the tedious, largely rote calculations that constitute the application of these principles  But principles are more likely to be remembered when knowledge of them is grounded in habits ingrained by painstaking applications of those principles
The very fact that calculators make calculation easier, ttherefore, makes it reasonable to restrict their use
Some students who know how to use calculators also thoroughly understand the mathematical principles that calculators obey.