四年级数学下册3.2《街心广场》课件2北师大版.ppt

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街心广场,教学目标,本节课我们主要来探索乘数和积的小数的位数之间的关系乘数扩大或者缩小积会有什么变化呢?同学们要积极的去探索,自己总结规律。,你发现三个长方形的长之间有什么关系,宽之间有什么关系?它们的面积之间可能会有什么关系?,600,花坛的面积为32=( )(米 ),2,6,3米,2米,0.3米,0.2米,0.3米=3分米,0.2米=2分米,0.06,30,20,600,3,2,6,0.3,0.2,0.06,积的小数位数与乘数的小数位数有什么关系?与同学进行交流。,本课小结,这节课你都学了什么?自己总结一下!,

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