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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,课前小测,1.,补充口诀,再根据口诀写出两个乘法算式。,六八()三八(),一六()六七(),四十八,二十四,得六,四十二,68=48,86=48,38=24,83=24,16=6,61=6,67=42,76=42,2.,每次加,9,,把得数填在空格里。,9,18,27,36,45,54,63,72,81,1,个,9,91=9,一九得九,2,个,9,92=18,二九十八,1,个,9,91=9,一九得九,+9,做一做,95=,96=,94=,93=,92=,91=,99=,97=,98=,45,54,36,27,18,9,81,63,72,2.,在下面的表里找出,9,、,9,的,2,倍、,3,倍,9,倍,把这些数圈起来。,例,2,6,9=,(),想一想:你用哪句口诀?,(),54,六九五十四,29=39=79=,59=69=19=,89=49=,计算下面各题。,18,27,63,45,54,9,72,36,第一组,93=95=92=,39=59=29=,口诀,口诀,口诀,2.,用一句口诀写出两道乘法算式。,八九七十二,四九三十六,27,27,45,45,18,18,三九二十七,五九四十五,二九十八,89=72,98=72,49=36,94=36,达标小测,找规律填空。,91=9 9,比,10,少,1,92=18,18,比,20,少,2,93=,()比()少(),94=,()比()少(),95=,()比()少(),96=,()比()少(),97=,()比()少(),98=,()比()少(),99=,()比()少(),27,27,30,3,36,36,40,4,45,45,50,5,54,54,60,6,63,63,70,7,72,72,80,8,81,81,90,9,第二组,
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