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商不变的规律 - PowerPoint PPT Presentation

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Presentation Transcript

2800÷700

= 4

3500÷500

= 7

4500÷900

= 5

1400÷200

= 7

4200÷600

= 7

150÷30

= 5

70

(1)70扩大( )倍是4900。

25

(2)2500缩小100倍是( )。

3500

(3)35扩大100倍是( )。

35

(4)3500缩小100倍是( )。

10

6

6

6

6

(1) 把第2、3、4组分别同第1组比较，被除数和除数

(1) 把第3、2、1组分别同第5组比较，被除数和除数

10

6

6

6

6

1. 在除法里，被除数扩大3倍，除数缩小3倍，

×

2. 在除法里，被除数扩大5倍，除数扩大6倍，

×

11

3600÷600

= (3600÷100)÷(600÷100)

= 36÷6

= 6

11

3600÷600

= 36÷6

= 6

11

3600÷600

= 6

11

4800÷400

= 12

36÷3 =

12

8

20

72÷9 =

80÷4 =

12

360÷30 =

720÷90 =

8

20

800÷40 =

12

3600÷300 =

7200÷900 =

20

8

8000÷400 =