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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,*,9,的乘法口诀练习课,义务教育课程标准实验教科书二年级上册,填一填,四九（）十六,(),九十八,(),九六十三,三,(),二十七,(),九八十一,八,(),七十二,(),九四十五,六,(),五十四,九,七,九,九,五,九,二,三,97=,98=,95=,96=,94=,98=,95=,96=,99=,4=,36,9,=,72,9=,63,81,36,72,45,54,9,8,7,9,=,45,5,97=,63,花儿后面藏着谁？,=,9 7 63,对号停车,6,5,17+12,4,8,9,3,13+18,7,4,1,2,3,4,5,6,7,8,9,7,8,9,14,21,28,35,42,49,56,63,8,16,32,56,42,40,64,72,9,18,27,36,54,63,72,81,7,24,45,问题：,1.,请把,9,的乘法口诀的,得数圈出来。,2.,仔细观察这些得数，,你有什么新发现吗？,规律：,1.,相邻的每句口诀的积之间相差,9,。,2.,积的个位、十位上的数相加的和都是,9,。,3.,得数个位上的数逐渐少,1,、十位上的数逐渐多,1,。,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,规律：,4.,是几的口诀，积就是几十减几。,问题：,3.,还有一条规律呢，,谁看懂了？,4.,能用一句话说说你,发现的这个规律吗？,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,3,米,=,（）,米,3 9 27,6件衬衫用多少个扣子,？,_,_,=()个,9,6,54,答：,6,件衬衫用,54,个扣子。,问题：,1.,仔细观察这幅图，你都知道了什么？,3.,要想求出,“,9,只脚踏船最多可坐多少人,”,，怎么解答？,2.,“,限坐,”,是什么意思？,4.,为什么要用乘法计算？,5.,你还能提出其他用乘法解决的问题并解答吗？,3,9,27,（人）,3.,
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