小学数学北师大版五年级上册谁打电话的时间长PPT课件

北师大版四年级数学下册 本节课我们继续来学习 小数的除法，通过打电 话的实际例子，理解小 数除法的计算规则。 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 15 150   除数 5 50 500 商     33 3 1500 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？ 8.54÷0.7= 0 7 8 5 4 7 1 1 . . 扩大它 的10倍 扩大它的10倍 12.2(分) 5 2 1 4 1 4 2 1 4 0 . 甲 国内长途 每分0.7元 . 眼镜打电话的时间是： 大头打电话的时间是： 国际长途 每分7.2元 乙 45÷7.2 = 7 2 4 5 4 3 2 6 1 8 . 在被除数末尾 用“0”补足。 6.25(分) 0 0 .2 1 4 4 3 6 0 5 3 6 0 0 8.54÷0.7= 12.2(分) 45÷7.2 = 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。 奶奶编“中 国结”，编 一个要用 0.85米丝绳。 这里有7.65 米丝绳。 这些丝绳可 以编几个 “中国结”？ 7.65÷0.85= 除数是小数的除法计算方法： ①移动除数的小数点，使它变成整数； ②除数的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）； ③按照除数是整数的小数除法进行计算。 努 力 吧 ！ 0.78÷0.2=( )÷2 0.7÷0.25=( )÷25 4.06÷0.58=( )÷( ) 32÷0.08=( )÷( ) 填一 填 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。 2.6 62.4 0.16 0.544 森林医生 24÷0.12=（ ） A、24÷12 B、2400÷12 C、2.4÷1.2 B 2.15÷0.6（ ）2.15 A、＜ B、＞ C、= B 本节课我们主要学习了小数 的除法，同学们掌握的怎么 样？大家分组讨论一下我们 今天学习的内容! 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