Mental calculation: Revision history

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3 January 2015

2 February 2014

  • curprev 17:3417:34, 2 February 2014‎ en>Guy vandegrift‎ 38,211 bytes +38,211‎ Removing template "How to". A how_to article would have more examples and more advice. This article has just the facts and therefore belongs.

19 August 2012

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