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Calculators

Calculators don't normally fit people's ideas of educational computing, but the need to calculate numerical tables for navigation, tides and gunnery was a major driving force for the invention of algorithms and computers, and thus calculators hold a special place in the historical development of computing at its most mathematical and its teaching.
Noisy calculators
Hundreds of students using mechanical calculators in an examination makes a distracting noise
Using a calculator in an arithmetic exam
Using a Brunsviga mechanical calculator for O-Grade Arithmetic examination
Electronic calculators and imperial units
An early encounter with electronic calculators in quantity surveying
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http://www.naec.org.uk/stories/copy_of_calculators