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一、激活经验,初步感知“平均数”师:老师发现,同学们又长高了不少。谁愿意告诉大家自己的身高?(五位学生汇报身高:149厘米、146厘米、136厘米、132厘米、142厘米)师:根据这些数据,你能估计一下五名同学的平均身高是多少厘米吗?生1:我估计可能是142厘米。因为平均身高应该接近
First, activate the experience, the initial perception of “average” division: the teacher found that students are a lot taller. (Five students report their height: 149cm, 146cm, 136cm, 132cm, 142cm) Teacher: Based on these data, can you estimate the average height of five students is how many centimeters? Health 1: I estimate it may be 142 cm. Because the average height should be close