四年级数学下册3.4《蚕丝》课件1北师大版.ppt

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1、一条春蚕吐出的丝长约多少千米?,1.25, 1.2,250,125,1500,1.5 千米,答:一条春蚕吐出的丝长约1.5千米。,一条春蚕吐出的丝长约多少千米?,1.21.25,110.20.25,1.05(千米),?,1,0.25,1,0.2,11,10.25,10.2,0.20.5,1110.2510.20.20.5,1.5(千米),织一条丝巾大约要用300条秋蚕吐的丝,一条丝巾的质量约多少克?,0.35, 300,10500,105 克,答:一条丝巾的质量约105克。,想一想,计算小数乘法时要注意什么?,算一算,填一填,你发现了什么?能再举个例子说明你的发现吗?,2.76,2.415,2

2、3,2.07,1.978,1.买一个4.6千克的西瓜要花多少元?说说谁算得对。,2.不计算,你能判断下列计算是否正确吗?与同伴交流。,积1.5,积97,积2.8,3.请你给下列得数点上小数点,使计算正确。,4.先想一想积比第一个乘数大还是小,再计算。,0.1250 2.60.5 1.32.2 9.60.8,5.,乌龟的爬行速度大约是0.05米/秒,兔子的奔跑速度是乌龟的280倍。兔子的奔跑速度是多少?,6.世界上最高的鸟是鸵鸟,最高的哺乳动物是长颈鹿。一只鸵鸟身高是2.75米,一只长颈鹿的身高是鸵鸟的2.2倍。这只长颈鹿的身高是多少米?,课堂小结,这节课我们学习了哪些内容?你还有哪些不明白的地方吗?,

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