5的乘法口诀,4+4+4+4+420,54( ),20,做乘法,想加法,5+5+5+520,乘法口诀,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,一五( ),三五( ),五五( ),四五( ),二五( ),把口诀补充完整,得五,十五,二十五,二十,一十,听口诀写算式,想口诀再计算:,35,三五十五,51,一五得五,15,5,25,10,20,20,10,55,五五二十五,52,二五一十,45,四五二十,25,二五一十,54,四五二十,3,5,15,5,3,15,三五十五,5,5,5,15,20,25,