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[教学实录]1.猜测感悟平均数。教师出示两个纸袋,并向学生提出:第一个纸袋内有3根小棒,平均每根长度是15厘米;第二个纸袋中也有3根小棒,平均每根长度是10厘米。如果从两个纸袋中各拿出一根,比较这两根长度应该哪一个纸袋中的棒长?
[Teaching Record] 1. Guess the average perception. The teacher presented two paper bags and proposed to the student that there were three small sticks in the first paper bag with an average length of 15 cm each and three sticks in the second paper bag with an average length of 10 cm each. If you take one from each of the two paper bags, which one should be longer than the other?