冀教版小学数学四年级认识平均数及求平均数的方法教学目标1.结合具体事例，经历认识平均数、求平均数以及讨论平均数意义的过程。2.初步体会平均数
的作用，能计算平均数，了解平均数的实际意义。3.积极参加数学活动，体会用“平均成绩”说明问题的公平性。探究新知要使每个笔筒放的铅笔
同样多，可以怎样做？铅笔：15支铅筒：5个探究新知要使每个笔筒放的铅笔同样多，可以怎样做？拿出1支放入此笔筒拿出2支放入此笔筒探究
新知3支铅笔是这5个笔筒每个笔筒的平均支数。探究新知四（1）班一、二组同学进行投球，每人投10个。每组有几人？每个人投中几个球？探
究新知四（1）班一、二组同学进行投球，每人投10个。探究新知四（1）班一、二组同学进行投球，每人投10个。小组合作算出每个组的平均
成绩看一看。探究新知（8＋7＋6＋7）÷4第一小组：＝28÷4＝7（个）探究新知（9＋8＋5＋3＋5）÷5第二小组：＝30÷5＝6
（个）探究新知观察说一说哪一组的成绩好？第一组的成绩好。因为第一组平均每人投中的个数比第二组平均每人投中的个数多。课堂小结归纳总结
平均数的意义：一组数据中的所有数据之和除以这组数据的个数所得的数叫这组数据的平均数。探究新知亮亮把自己家一星期丢弃塑料袋的情况作了
统计。算一算：平均每天丢弃几个塑料袋？（1＋3＋2＋3＋2＋6＋4）÷7＝21÷7＝3（个）答：平均每天丢弃3个塑料袋。探究新知求
出的“3个”是每天实际丢弃塑料袋的个数吗？课堂小结归纳总结平均数的计算方法：平均数＝总数量÷总分数face.qm120.c
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rongzg.com/shangxun/7302.htmlkuaibao.qq.com/s/20180417A0VP0D00巩固应用1.新华小学四（1）班第五组和第六组同学的体重统计如下，分别计算两组同学的平均体重。（单位：千克）巩固应用2.“小小”的冷饮店一个星期售出饮料的情况如下表：（1）平均每天售出多少箱饮料？（28＋14＋16＋18＋17＋22＋25）÷7＝140÷7＝20（箱）答：平均每天售出20箱饮料。巩固应用2.“小小”的冷饮店一个星期售出饮料的情况如下表：（2）冷饮店每个星期进一次货，下星期“小小”冷饮店准备多少箱饮料比较合适？ |
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