四年级数学下册第1单元《四则运算》0的运算教案新人教版.doc

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10 的运算教学目标:1、知道关于 0 的运算应该注意的问题。 2、培养学生整理知识的能力。教学重难点:0 不能做除数及原因。导入新课口算引入( 快速口算)出示: 100+0= 0+568= 078= 023=128-128= 076= 235+0= 99-0= 49-49= 0+319= 029=学习新知二、探究新知 1、将上面的口算分类.根据分类的结果说一说关于 0 的运算都有哪些。 2、一个数与 0 相加;一个数减 0;一个数与 0 相乘的结果分别是多少。 3、0 除以一个数的结果是多少?在这里为什么不说一个数除以 0.三、0 为什么不能做除数(讨论)0 不能作除数。例如,5 0 不可能得到商,因为找不到一个数同 0 相乘得到 5。0 0 不可能得到一个确定的商,因为任何数同 0 相乘都得 0。小结:归纳所有 0 的运算一个数加上 0,还得原数。被减数等于减数,差是 0。0 除以一个非 0 的数,还得 0。一个数和 0 相乘,仍得 0。4、课堂测评1.计算 (1)36+0= (2)0+68= (3)068= (4)54-0= (5)028= (6)128-0= (7)036= (8)25+0= (9)99-0= (10)49-49= (11)0+39= (12)09= 五、归纳反思 这节课我们有什么收获。还有什么疑问。关于 0 的运算应该注意的2

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