《乘法口訣表》PPT課件.ppt
乘法口訣表,乘法口訣表,二二得四,一四得四,二三得六,一六得六,二四得八,一八得八,三三得九,一九得九,三四十二,二六十二,四四十六,二八十六,二九十八,三六十八,四六二十四,三八二十四,六六三十六,四九三十六,哪兩句口訣的積相同?,四,六,八,九,十二,十六,十八,二四,三六,利用口訣表,填出乘法表,你發(fā)現(xiàn)了什么?,1,2,3,4,5,6,7,8,9,2,4,6,8,10,12,14,16,18,3,6,9,12,15,18,21,24,27,4,8,12,16,20,24,28,32,36,5,10,15,20,25,30,35,40,45,6,12,18,24,30,36,42,48,54,7,14,21,28,35,42,49,56,63,8,16,24,32,40,48,56,64,72,9,18,27,36,45,54,63,72,81,1,2,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9,2,4,6,8,10,12,14,16,18,3,6,9,12,15,18,21,24,27,4,8,12,16,20,24,28,32,36,5,10,15,20,25,30,35,40,45,6,12,18,24,30,36,42,48,54,7,14,21,28,35,42,49,56,63,8,16,24,32,40,48,56,64,72,9,18,27,36,45,54,63,72,81,1,2,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9,利用口訣表,填出乘法表,你發(fā)現(xiàn)了什么?,( )里最大能填幾?,( )429 ( )855,7( )29 ( )638,435( ) 60( )9,7,6,8,6,4,6,找規(guī)律填數(shù)。,85=( )8,97=( )9,49=( )6=( ),3( )=4( )=24,2( )=3( )=18,5,7,6,36,8,6,9,6,根據(jù)關(guān)系填空:,=28 =9 =11 =( ),15,