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二年级数学下册三《生活中的大数》5有多少个字课件北师大版.ppt

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我国古代数学家祖冲之，从小热爱读书，人们称赞他是个博学的青年。他经常观测太阳等星球的运行情况，测定出的月亮绕地球一周的天数非常精确，跟现代科学测定的结果相差不到1秒。祖冲之在世界各国都颇受尊重。在法国巴,黎科学博物馆的“发现宫”中有祖冲之的名字和他发现的圆周率值，西方科学家还把月球上的一个火山口命名为“祖冲之口”。,200,300,90,5,100,200,4.大约有多少枚棋子？估一估，说一说。,你学到了什么？,

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