1. A matchbox is 4cm long, 2.5cm wide and 1 cm high. The total length of its sides is 30 cm.

2. Make a 5cm long cube frame with wire, and at least 60cm of wire is needed.

The sum of the sides of a cuboid is 96 cm, 9 cm long, 8 cm wide and (7) cm high.

The sum of the sides of the cube is 36 cm. The surface area of this cube is (54 square centimeters) and the volume is (27 cubic centimeters).

5. The rectangular body is 6 decimeters long, 6 decimeters wide and 8 decimeters high. It covers an area of (36 square decimeters), has a surface area of (240 square decimeters) and a volume of (288 cubic decimeters).

6. Volume should be measured in units of (volume). Commonly used unit of volume are (cubic centimeter), (cubic decimeter) and (cubic meter).

7. Fill in the appropriate units:

The length of a wire is 5 (cm), and the volume of an eraser is 5 (cm 3).

The area of a living room is 30 cubic meters, and the volume of a medicine bottle is 100 ml.

An aluminum can can hold 12 liter of water.

8. Unit conversion:

6.2 cubic decimeter =(6200) cubic centimeter 0.05 cubic meter =(50) cubic decimeter

780ml =(0.87) L = (780ml).

4 liters 65 ml = (4.065) liters =(4.065) ml.

(0.035) cubic meter =35 cubic decimeter =(0.035) cubic meter

9. An external rectangular pool covers an area of 6 square meters with a depth of 1.5 meters, and the pool can hold up to 9000 liters of water.

10, cut a cube with a side length of 2 decimeters into two equal cuboids, and increase the surface area by (2) square decimeters.

1 1, the length and width of a cuboid are 4cm, the volume is 64cm, and the height of this cuboid is (4) cm.

12. Cut a rectangular wood with a length of 2m into two sections, and the surface area will increase by 1.6 m2, and the volume of this wood will be (0.08) m3.

13. The circumference of the bottom of the cube is 32 cm, the sum of the sides is (96) cm, the surface area is (384) cm 2, and the volume is (5 12) cm 3.

14, the side length of the cube is expanded by 4 times and the volume is expanded by (64) times.

15. Put three cubes with a side length of 2 decimeters into a cuboid with a surface area of (56) square decimeters and a volume of (24) cubic decimeters.

16. The base area of a cuboid is 4 square decimeters, the length is 6 decimeters, and the volume is (24) cubic meters.

17. A piece of wood is 2 meters long, its cross section is a square with a side length of 0.4 meters, and its volume is (0.8) cubic meters, that is, (800) cubic decimeters.

Second, the question of right and wrong:

1. At most two of the six faces forming a rectangle are squares. (√)

2. At most four of the six faces of a cuboid (excluding cubes) are the same. (√)

3. At most four of the 12 edges of a cuboid have the same length. (10)