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Topic: data on which are the hardest multiplication facts


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Subject:   RE: data on which are the hardest multiplication facts
Author: DanielAjoy
Date: Aug 16 2010
I did find a study:

Relative Difficulty of the One Hundred Multiplication Facts with Special
Reference to Textbook Construction

Author(s): G. M. Ruch
Source: The Elementary School Journal, Vol. 32, No. 5 (Jan., 1932), pp.
369-377

Published by: The University of Chicago Press

Stable URL: http://www.jstor.org/stable/995927

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