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一、创设情境,准备建模师:同学们,今天我们先来一起收集第一小组同学年龄的信息。生:12岁13岁12岁12岁11岁师:你们能算出这5位同学的平均年龄吗?根据学生汇报板书算式:(12+13+12+12+11)÷5=12(岁)师:你们想知道刘老师的年龄吗?师揭示年龄(42岁)。(板书)师问:加上刘老师的年龄,请你们迅速算一算这一组数据的平均年龄?板书:平均数17岁学生上台并采访学生:你是17岁吗?
First, create the situation, ready to be modeled Teacher: Classmates, today we first come together to collect information on the age of the first group of students. Students: 12 years old 13 years old 12 years old 12 years old 11 Division: You can calculate the average age of these five students? According to the students report board calculation formula: (12 +13 +12 +12 +11) ÷ 5 = 12 (years) Teacher: Do you want to know Teacher Liu’s age? Teacher reveals age (42 years). Teacher (teacher): Add Mr. Liu’s age and ask you to quickly calculate the average age of this group of data? BLOCK BOOK: Average 17-year-old students come to power and interview students: Are you 17 years old?