In this paper, I shared that my 77 preservice teachers initially had a difficult time
understanding the mathematical basis for the 2-digit multiplication algorithm, by
exploring three different algorithms (one familiar, and two unfamiliar ones). Then, I
reported that when the preservice teachers worked together in groups to explain the
mathematical basis for the algorithms, they did much better than when they responded
individually. Finally, I shared the steps I took to redress the preservice teachers’ lack of
understanding, namely, by a) using a rectangular model to represent 2-digit
multiplication, b) connecting the 3 different algorithms to the rectangular model,
c) discussing why some 2-digit multiplication did not seem to give rise to correct answers
when the third algorithm was used, and d) letting the preservice teachers conduct
In this paper, I shared that my 77 preservice teachers initially had a difficult timeunderstanding the mathematical basis for the 2-digit multiplication algorithm, byexploring three different algorithms (one familiar, and two unfamiliar ones). Then, Ireported that when the preservice teachers worked together in groups to explain themathematical basis for the algorithms, they did much better than when they respondedindividually. Finally, I shared the steps I took to redress the preservice teachers’ lack ofunderstanding, namely, by a) using a rectangular model to represent 2-digitmultiplication, b) connecting the 3 different algorithms to the rectangular model,c) discussing why some 2-digit multiplication did not seem to give rise to correct answerswhen the third algorithm was used, and d) letting the preservice teachers conduct
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