一年级数学下册第5章认识人民币5.2.2简单的计算课件新人教版.ppt

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1.填一填,1元5角( )角 32角( )元( )角 46角( )元( )角 5元=( )角,2.算一算,15,2,3,50,4,6,2元8角,2元8角,你还能提出什么 数学问题?,我买这两个, 要多少钱?,你知道了什么?,用13元钱正好可以买哪两种杂志“正好”是什么意思?,“正好”就是不多也不少。, 14元,怎样解答?,共11元,共13元,共12元,,,,,我先选定一本,,还可以选 定,然后按顺序试,,继续再试,还可以想加法 ( )( )13 ,还可以怎样解答?,用13元正好可以 买 和 。,用13元正好可以 买 和 。,解答正确吗?,归纳总结,(1)19元正好可以买哪两种玩具?,(2)19元正好可以买哪些玩具?,(1)19元正好可以买 和 。,(2)19元正好可以买 和 ,,或 和 和 。,这节课你有什么收获?,在钱数限定的条件下买物品:,方法一:先随便选择几种物品,算出它们的总价,再根据这个总价和实际的钱数进行调换。,方法二:先按一定的顺序选定一种物品,再与剩下的物品一一去试,找出所有的购买方案。,作业,请完成教材第59页练习十三,第3题,第4题。,xx小学 x年级x班,xxx,

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