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| Part 4:
Teacher and Students Presenting Alternative Solution Methods [Begin: 21:40]
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The teacher introduces another method by saying, "I’ve thought about it too, so... what do you think about this way of thinking." He then describes a method of subtracting off the savings of a cheaper cake (30 yen) from the amount needed to buy all delicious cakes (2300 yen). One would need to subtract seven times to get below the 2100 yen, so one could buy only three delicious cakes. Not all students understand his explanation so he asks another student, whom he knows has used an algebraic inequality, to explain. The student verbally describes the inequality 230x + 200(10-x) < 2100. After the student’s presentation, the teacher challenges students to come up with explanations that others can understand. | ||
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