Lesson Study Video for Thinking Systematically: Understanding The Problem (2 of 6)
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Understanding the problem (2 of 6)
The specific problem for today’s lesson is now stated. It is posted on the board. The teacher asks students what they think needs to be done. Some students propose specific groupings of pencils and ball-point pens. After a short discussion, students agree that a table needs to be used.
Setting up a table is now considered in detail. The teacher posts cards showing Number of ball-point pens, Number of pencils, and Total cost. He says, “We need a table like this.” This step ensures that everyone is on the same track. Getting the first entry involves some discussion about whether zero can be used. It is accepted that (10, 0) – ten ball-point pens and zero pencils – will be the first entry. Total cost of this combination is 700 yen. A second entry is prepared on a separate card showing (9, 1) and its total cost of 670 yen.
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