don steward
mathematics teaching 10 ~ 16

Thursday, 27 October 2011

odd one out

This idea was in a chapter of the 1988 NCTM 'Algebra' yearbook, by David J Glatzer.

Students decide which one of the four examples does not belong. They may be able to find a rule which precludes one of the options which is not the same as that intended (which is fine - as long as they can justify it).

some examples:

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