四年级数学上册第4单元《三位数乘两位数》一个因数中间有0的乘法课件2新人教版.ppt

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一个因数中间有0的乘法,一共摘了多少个仙桃?,0和任何数相乘都得0。,想一想,03= 90= 00= ,任何数,0,0,0,做一做 02= 50= 06= 08= 20= 50= 60= 08=,0和一个数相乘与0和一个数相加结果有什么不同?,0,0,0,0,0,0,5,8,想一想,0和任何数相乘都得0。,0和任何数相加都得原数。,读一读,1 0 3 1 0 9 2 52 6 5 5,智勇大冲关,第一关:方框里面藏着几?,0,4,4,第二关:书上85页第1题。,第三关:书上85页第2、3题。,(1)7 0 8 32 1 4 ( ),第四关:判断改错。,2,5,(2)0和任何数相加都得 ( ),0。,原数。,2,(3)0和任何数相乘都得0。 ( )(4)1027积的中间有一个0. ( ),当102时,积的中间一定有一个0?,(5)因数中间有0,乘得的积中间 ( )(6)0 1 9的积一定是四位数. ( ),一定有0。,不一定有0。,你能很快说出下面两个算式哪个得数大吗?,1+2+3+4+5+6+7+8+9+01234567890,智慧星(五),抢答,小组活动: 从数字“09”中任选4个数字,编成三位数乘一位数的算式再算出来。要求三位数的中间必须有0。比一比相同时间里谁编、算的算式多!,游戏,

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