This is consistent with this review [0] I once read of a book [1] about mathematics teaching in elementary schools. [0] http://www.ams.org/notices/199908/rev-h

This is consistent with this review [0] I once read of a book [1] about mathematics teaching in elementary schools. [0] http://www.ams.org/notices/199908/rev-howe.pdf http://www.ams.org/notices/199908/rev-howe.pdf [1] Knowing and Teaching Elementary Mathematics: Teachers’ Understanding of Fundamental Mathematics in China and the United States, by Liping Ma