# 包 装 - PowerPoint PPT Presentation

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## 包 装

0.263×100=

1.675÷1000=

0.98×1000=

26.3

0.001675

980

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。

2. 会判断乘积与各因数之间的大小关系。

0

0

7 8

× 24 3 1 2

0.

0.

1 0 8 8

1 5 6

1 8 7 2

5. 9×

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

.

5.90 ×3.8=

2 2 .4 2（元）

2 2. 4 2元＜25元

4.32

4.8

4.8 ×0.9=

4.8 ×1=

4.8 ×1.2=

4.8

4.8

=

5.76

4.8

### 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。

654 ×0.9○654

1 ×0.95 ○ 0.95

2.43 ×1.01 ○ 2.43

0.98 ×3.89 ○ 3.89

=

### 检查自己是否学会了？

9.6×0.6= 0.35×2.4=

0.083×4.1= 1.42×0.81=

6.33×0.9（ ）6.33

3.992×1（ ）3.992

0.54×1.01（ ）1.01

0.896×0.78（ ）0.896