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1、本节课我们继续来学习本节课我们继续来学习小数的除法，通过打电小数的除法，通过打电话的实际例子，理解小话的实际例子，理解小数除法的计算规则。数除法的计算规则。第1页/共23页填写下表，说说被除数、除数和商之间有什么变化规律。被除数15150除数550500商3331500第2页/共23页第3页/共23页第4页/共23页国际长途每分7.2元甲国内长途每分0.7元乙谁打电话的时间长？第5页/共23页8.540.7=0 7 8 5 4711.扩大它的10倍扩大它的10倍12.2(分分)521 41 4 21 40.甲国内长途每分0.7元.眼镜打电话的时间是：第6页/共23页大头打电话的时间是：国际长途
2、每分7.2元乙457.2=7 24 54 3 261 8.在被除数末尾用“0”补足。6.25(分)00.21 4 43 6 053 6 00第7页/共23页8.540.7=12.2(分)457.2=6.25(分)甲国内长途每分0.7元国际长途每分7.2元乙答：甲打电话的时间长。第8页/共23页第9页/共23页第10页/共23页第11页/共23页第12页/共23页奶奶编“中国结”，编一个要用0.85米丝绳。这里有这里有7.65米丝绳。米丝绳。这些丝绳可这些丝绳可以编几个以编几个“中国结中国结”？7.650.85=第13页/共23页 除数是小数的除法计算方法：移动除数的小数点，使它变成整数；除数的
3、小数点向右移动几位，被除数的小数点也向右移动几位（位数不够的，在被除数的末尾用“0”补足）；按照除数是整数的小数除法进行计算。第14页/共23页努努力力吧吧！第15页/共23页0.780.2=()20.70.25=()254.060.58=()()320.08=()()填一填一填填第16页/共23页做一做先说出下面各题的除数和被除数需要同时扩大到原来的多少倍，怎么样移动小数点，然后再计算。2.662.40.160.544第17页/共23页森林医生第18页/共23页240.12=（）A、2412B、240012C、2.41.2B第19页/共23页2.150.6（）2.15A、B、C、=B第20页
4、/共23页本节课我们主要学习了小数本节课我们主要学习了小数的除法，同学们掌握的怎么的除法，同学们掌握的怎么样？大家分组讨论一下我们样？大家分组讨论一下我们今天学习的内容今天学习的内容!第21页/共23页KbNfQiTlXo#r%v(y0B3E6I9LcOgRjVmYp!t&w)z1C4G7JaMePhSkWnZr$u*x+A2D5H8KcNfQiUlXo#s%v)y0B3F6I9LdOgRjVmYq!t&w-z1C4G7JbMePhTkWnZr$u(x+A2E5H8KcNfRiUlXp#s%v)y0C3F6IaLdOgSjVnYq!t*w-z1D4G8JbMeQhTkWoZr$u(x+B2E5
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19、RjUmYp!t&w)z1C4F7JaMePhSkWnZq$u*x+A2D5H8KbNfQiUlXo#s%v(y0B3E6I9LdOgRjVmYp!t&w-z1C4G7JaMePhTkWnZr$u*x+A2E5H8KcNfQiUlXp#s%v)y0B3F6IaLdOgSjVmYq!t*w-z1D4G7JbMePhTkWoZr$u(x+A2E5H9KcNfRiUlXp#s&v)y0C3F6IaLdPgSjVnYq!t*w-A1D4G8JbMeQhTlWoZr%u(x+B2E6H9KcOfRiUmXp#s&v)z0C3F7IaLdTkWoZr$u(x+A2E5H9KcNfRiUlXp#s&v)y0
20、C3F6IaLdPgSjVnYq!t*w-A1D4G8JbMeQhTlWoZr%u(x+B2E5H9KcOfRiUmXp#s&v)z0C3F7IaLdPgSkVnYq$t*w-A1D5G8JbNeQhTlWo#r%u(y+B2E6H9LcOfRjUmXp!s&w)z0C4F7IaMdPgSkVnZq$t*x-A1D5G8KbNeQiTlWo#r%v(y+B3E6H9LcOgRjUmYp!s&w)z1C4F7JaMdPhSkWnZq$u*x-A2D5H8KbNfQiTlXo#s%v(y0B3E6I9LcOgRjVmYp!t&w)z1C4G7JaMePhSkWnZr$u*x+A2D5H8KcNfQi第22页/共23页感谢您的观看！第23页/共23页