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包 装. 直接写得数:. 0.263×100= 1.675÷1000= 0.98×1000=. 26.3. 0.001675. 980. 快速填空 :. 14 × 0.3 = 1.4 ×0.03 = 0.014 ×0.3 =. 4.2. 4×9= 0.4×9= 0.04×0.9=. 0.042. 0.0042. 36. 3.6. 0.036. 学习目标 :. 1. 理解小数乘小数的计算方法,熟练计算小数乘小数。

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5092726

包 装


5092726

直接写得数:

0.263×100=

1.675÷1000=

0.98×1000=

26.3

0.001675

980


5092726

快速填空:

14 × 0.3 =

1.4 ×0.03 =

0.014 ×0.3 =

4.2

4×9=

0.4×9=

0.04×0.9=

0.042

0.0042

36

3.6

0.036


5092726

学习目标:

1. 理解小数乘小数的计算方法,熟练计算小数乘小数。

2. 会判断乘积与各因数之间的大小关系。


2 6 0 85 0 8 2 4

例: 礼品店里,包装纸每米2.6元,彩带每米0.85元。 包装一个礼品盒需要: 包装纸0.8米,彩带2.4米。

问题:

包装一个礼品盒需要多少元?


1 3 6 8

0

0

1 3 6× 8

点出上小数点

7 8

× 24 3 1 2

0.

0.

1 0 8 8

1 5 6

1 8 7 2


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我是小法官

5. 9×

错在那里?

0. 4 3

1 7 7

0. 3 9×

2 3 6

0. 4

2 5 3 7

0.

1 5 6

4 1 3

.


5092726

应用题

妈妈想买3.8千克香蕉,25元够吗?

5.90 ×3.8=

2 2 .4 2(元)

2 2. 4 2元<25元

答:买3.8千克香蕉,25元够用。

每千克5.90元


5092726

动脑筋:乘积与因数的大小关系是怎样的?

4.32

4.8

4.8 ×0.9=

4.8 ×1=

4.8 ×1.2=

4.8

4.8

=

5.76

4.8


5092726

你能总结出规律吗?

  • 一个数乘以小于1的数,得到的积比原来的数小。

  • 一个数乘以大于1的数,得到的积比原来的数大。


5092726

在○里填上“>、<或=”号

654 ×0.9○654

1 ×0.95 ○ 0.95

2.43 ×1.01 ○ 2.43

0.98 ×3.89 ○ 3.89

=


5092726

检查自己是否学会了?

用竖式计算:

9.6×0.6= 0.35×2.4=

0.083×4.1= 1.42×0.81=

判断大小:(在括号里填>、<或=号)

6.33×0.9( )6.33

3.992×1( )3.992

0.54×1.01( )1.01

0.896×0.78( )0.896


5092726

你学到了什么?


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