Do We Truly Understand Place Value? - The Learner's Way - 5 views
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Nigel Coutts on 08 Sep 19James Tanton shattered my understanding of the vertical algorithm. More than that, he helped me to see how poorly I understood place value and that many of my students function with the same misunderstanding. What made the experience more humbling was that it took him less than two minutes to do this.