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A comment on How to Divide any number By 9, 90, 900 and so on in just 5 seconds . Parent comment

Re:How to Divide any number By 9, 90, 900 and so on in just ... by budgi3 on Tuesday March 06, 2012 @09:42AM (#3671173)
The trick seems to be a combination of both. Learning by rote in combination with an effective method seems to be key to strong number sense in kids. Take a look at the Triple Code Model (Dehaene & Cohen) for some more detail.
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