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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,#,第四单元,探索规律,看下面的图形,你能发现什么,画一画。,?,?,看下面的图形,你能发现什么,然后填一填。,2,,,4,,,8,,,16,,,(),我发现第,2,组图形中小正方形的个数是第,1,组的,2,倍。,2,,,4,,,8,,,16,,,(),32,我发现,22=4,,,42=8,,,82=16,你会填吗?试一试。,5,,,10,,,20,,,40,,(),,160,。,3,,,9,,,27,,,81,,(),,729,。,2,,,8,,,32,,,128,,(),,2048,。,512,243,80,看下面的图形,你能发现什么,然后填一填。,24,,,12,,,6,,,(),48,,,我发现第,2,组图形中小正方形的个数是第,1,组的一半。,我发现,482=24,,,242=12,,,122=6,24,,,12,,,6,,,(),48,,,3,你会填吗?试一试。,81,,,27,,,9,,(),,1,。,1296,,,216,,(),,6,,,1,。,(,),,125,,,25,,,5,,,1,。,625,36,3,依题意写出,5,个数。,后一个数是前一个数的,4,倍。,1,,,4,,,16,,,64,,,256,2,,,8,,,32,,,128,,,512,3,,,12,,,48,,,192,,,768,依题意写出,5,个数。,前一个数是后一个数的,2,倍。,16,,,8,,,4,,,2,,,1,48,,,24,,,12,,,6,,,3,32,,,16,,,8,,,4,,,2,观察算式,并填一填。,19+2=11,129+3=,(),1239+,(),=1111,4,111,373=111,376=,(),37,(),=333,222,9,总结反思,回忆交流,:,同学们,,通过本节课的学习,,你们都学到了什么知识呢?都有什么样的收获呢?,1.,学会探索数字规律。,作业布置,1.,课本练习十二第,2,题和第,3,题。,谢谢大家,!,
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