1、3 20 12

2,811or 4 1 2 or 4 2 1

3、24 8

4、400 6

5、 1000 100

6、64 72

7、48 24?

8、5

9.1.02m3 =( 1020) cubic decimeter =( 1020) liter?

470 ml =(470) cubic centimeter =(0.47) liter?

10, a bottle of ink is about 50 ml, and the volume of a goldfish bowl is about 38 cubic decimeters.

The cover of a math textbook is about 280 (square centimeter), and the volume of a refrigerator is 1.5 (cubic meter).

1 1、32 136 96?

36 2 16 2 16

12、 1000 3?

13、60 66

Second, multiple choice questions

1、B 2、C 3、B 4、C 5、B 6、A 7、A 8、A

Third, the operation questions

1, omitted

2、6a2 10a2 14a2 22a2

3.30×2+20×2+25×4+25=225 (cm) 225 cm =22.5 decimeter.