ABSTRACT
On the following day, Thursday, November 18, Ms. Tsukuda taught the subtraction study lesson to her class during the second period of the day, which was from 9:30 to 10:15 a.m. Just like for the first version of this lesson, all the teachers at the school came to observe while their students were left alone with assigned work to complete. The principal, the vice-principal, and the outside advisor, Mr. Saeki, were also in attendance.
