资料简介
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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