1. The length of a cuboid is 8.5 cm, the width is 4.5 cm, and the height is 7 cm. What is the sum of the lengths of all its sides in centimeters?

(8.5+4.5+7)×4=80 cm

2. The sum of the edge lengths of a cube is 60 centimeters. What is its surface area in square centimeters?

The edge length of the cube is 60÷12=5 cm,

5×5×6=150 square centimeters

3. The volume of a cuboid wooden box It is 672 cubic decimeters. The length of the wooden box is 12 decimeters and the width is 7 decimeters. What is the height of this wooden box?

672÷12÷7=8 decimeters

4. A rectangular iron bucket, the bottom is a square with a side length of 3 decimeters, and the height of the bucket is 7.2 decimeters. Make it like this For a bucket without a lid, how many square decimeters of iron sheet is needed at least?

3×3+3×7.2×4=190.8 square decimeters

5. A rectangular steel plate, 24 decimeters long, 15 decimeters wide, 0.15 decimeters thick, each A cubic decimeter of steel weighs 7.8 kilograms. How many kilograms does this steel plate weigh? If paint is painted on the surface of the steel plate, how many square decimeters will the painted area be?

24×15×0.15×7.8=421.2 kilograms

(24×15+24×0.15+15×0.15)×2=731.7 square decimeters

6. The edge length of a cube is 1.5 decimeters. What is the sum of its edge lengths in decimeters? What is its base area in square decimeters?

1.5×12=18 decimeters,

1.5×1.5=2.25 square decimeters

7. A rectangular tea cylinder has a square base. The side length of the square is 7 cm and the height is 11 cm. How many square centimeters of iron should be used to make this tea cylinder?

(7×7+7×11+7×11)×2=406 square centimeters

8. A rectangular piece of wood has a volume of 240 cubic decimeters. This piece of wood is 2 meters long and 6 decimeters wide. How many decimeters is it thick?

2 meters = 20 decimeters

240÷20÷6=2 decimeters

9. A rectangular biscuit tube has a length and width of 20 cm and a height of 30 cm. If a circle of trademark paper is affixed around it (no stickers on the top and bottom), what is the at least square centimeter area of ??the trademark paper?

20×30×4=2400 square centimeters

10. Shengli Road Primary School needs to dig a rectangular sand pit, 4.5 meters long, 2.4 meters wide and 0.5 meters deep.

(1) How many square meters does this bunker cover?

(2) How many cubic meters of sand can this sand pit hold?

4.5×2.4=10.8 square meters

4.5×2.4×0.5=5.4 cubic meters

11. A rectangular fish tank is 60 cm long from the inside. The width is 30 cm and the height is 40 cm. The water surface in the tank is 5 cm away from the mouth of the tank. How many milliliters of water should be filled in the fish tank?

60×30×(40-5)==63000 cubic centimeters=63000 ml

12. A rectangular swimming pool is 60 meters long, 25 meters wide, and 2.5 meters deep.

(1) Use cement to plaster the four walls and bottom of the swimming pool. How many square meters will the cement area be?

(2) If the depth of the water is 2 meters and 1 cubic meter of water weighs 1 ton, how many tons does the swimming pool water weigh?

60×25+60×2.5×2+25×2.5×2=1925 square meters

60×25×2=3000 cubic meters

3000 ×1=3000 tons

Hope this helps you!