I wondered how many students helped understand why the fractions didn't add up like that, and how many students just messed up their heads. They immediately calculated the example correctly and wrote down a procedure for it. For an hour, I looked at students who were good at math. In my opinion, they completely lacked some extra work. The examples that were counted in the lesson were counted significantly earlier than the other students.
For an hour, I looked at students who were good at math.