新人教版三年级数学上册《分数的简单应用-(第2课时)》ppt教学课件

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情境导入
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有12名学生,其中 是女3生, 是男生。3男女生
各有多少人?
怎样求出男女生人数呢?
自主探究
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女生人数:
12÷3=4(人)
男生人数:
12÷3=4(人) 4×2=8(人)
答:女生有4人,男生有8人。
男生占总数的三分之二。
学以致用 图书角有45本图书。其中 是故事2书,故事书有多少本? 5
45÷5=9(本)
2×9=18(本)
答:故事书有18本。
总结提升
求一个数的几分之几是多少, 用总数除以分数的分母求出一 份,再用每份数乘分子求出几 份是多少。
分数的初步认识
分数的简单应用
第2课时
复习旧知
有8个圆,把其中的四分之一涂上蓝色,四分之二涂上粉色。
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同学们,这节课你们都学会了哪些知识?
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作业设计
课本102页 练习二十二 第5、6题
课堂小结
通过本节课的学习,你有什么收获?
总结收获
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