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Parents opt kids out of school laptops, ask for pen-and-paper
(www.nbcnews.com)
This is a most excellent place for technology news and articles.
Your special needs student using a calculator has pretty much no bearing on this conversation.
Even for students without disabilities, a calculator removes the cognitive demand of the arithmetic. If I am teaching algebra, I want most of their cognition to be taken up by the algebra, not the arithmetic.