Fill in the blanks:
1, both cuboids and cubes have (? ) a face, (? ) ribs, (? ) vertex. ?
2. Rectangular body length is 8 cm, width is 6 cm, height is 5 cm and side length is (? )cm； What is the largest area of six faces? ) square centimeter, surface area (? ) square centimeters. ?
3, 2850 square centimeters = (? ) square decimeter (? ) square centimeter 12.8m = (? ) decimeter = (? )cm？
4. Saw a cube with a side length of 1 decimeter into two small cuboids with a surface area of (? ) Square decimeter. ?
5. The side length of a cube is one centimeter, and its side length is (? ) cm, surface area (? ) square centimeters?
6. Using a small cube with a length of 1 cm to make a large cube with a length of 1 decimeter requires (? ) small cubes, arrange these small cubes in a row, long (? ) meters. ?
Second, the eyes are golden?
1, cut a cuboid into two equal cubes, and the surface area of each cube is rectangular? Half the surface area of the body. ( )?
2. A set of opposite faces is a cube, and the other four faces have the same area. (? )?
3. Enlarge the length, width and height of the cuboid by 2 times and the surface area by 2 times. ? (? )
4. The surface areas of two cuboids are equal, and the sum of side lengths must be equal. ? (? )
3. multiple choice questions?
1, the side length of the cube is reduced by 4 times, and the surface area (? )。 ? A, twice as small? B, reduced by 16 times? C, expanded 6 times
2. If the areas of four faces of a cuboid are equal, then the other two faces are (). ? A, uncertain B, rectangle? C, Fang?
3. Use iron wire to form a cuboid with a length of 7 cm, a width of 5 cm and a height of 2 cm. At least use wire (? ) centimeters. ? a、28 B、56 C、 1 18？
The sum of the sides of a cube is 48 cm, and its surface area is (? ) square meters. ? a、 16？ 48? c、96？ D, none of the above answers are correct
5. Of the six faces of a cuboid (excluding cubes), only (? ) The areas of the surfaces are equal. a、2？ b、3？ c、4 D？ five
Fourth, can I do the math?
1, the cuboid has a set of opposite faces that are squares, the perimeter is 16 cm, and the height of the cuboid is 16 cm. What is the surface area of this cuboid?
The sum of the sides of the cube is 72 cm. What is its surface area?
3. The length of a cuboid is 1.6 cm, the width is half the length, and the height is half the width. What is its surface area?
Fifth, solve the problem:?
1, a rectangular iron box with no cover, 2 decimeters long, 1.5 decimeters wide and 1 high? .8 decimeters, how many square meters of iron does it take to make 20 such iron boxes?
Naughty made a rectangular pencil box out of thick paper. It is known that this pen container is 8 cm long, 6 cm wide and 12 cm high. How thick cardboard does he need to make this pen container? (excluding joints)?
3. How many square decimeters of glass does Xiao Ming's father need to make a glass fish tank with a length of 30cm, a width of 15cm and a width of 25cm?
4. A classroom is10m long, 6m wide and 4m high. The area of doors and windows is 19.6 square meters. Paint the walls and ceiling of the classroom. If the paint is 0.25 kg per square meter, how many kg of paint does * * need?
Additional question: five identical cubes are glued into a cuboid, and the sum of the sides of this cuboid is 168 cm. What is the surface area of this cuboid?
?
Unit 3 and 4 exercises in the second volume of mathematics in the fifth grade of primary school? I. Fill in the blanks (20 points) ★
1, rewriting 2360250000 into a number in hundreds of millions is ().
2, 2.4 expansion 100 times is (? ); 2. 15 reduced to11000 is ().
3.7 What is the number consisting of ten, four 0.0 1 and nine 0.0 1? )。 This number is pronounced (? )。
4. Without changing the size of the number, rewriting 0.7 into three decimal places is (). ?
5, 2.56 have (? ) 1, with (? ) 0. 1 and (? ) 0.0 1.
6. Arrange the following figures in descending order. ? 0.8 0.089 0.78 ? 0.087 (? )? & gt？ (? )? & gt？ ()? & gt？ (? )
? 7. Decimal direction 0.05 (? ) Move () to 50, and then reduce 50 to its11000, with the decimal point to (? ) move (? ), the number is (? )。
8、(? )kg？ =? 2.0 1 ton
9、(? ) square meters? =? 2500 square centimeters
10、(? ) square decimeter? =? 8.3 square meters?
1 1、(? ) square meters? =? 76 hectares
12,4561m? =? (? ) kilometers?
13, 1.5 hours? =? (? ) points
14，7.08kg？ =? (? )kg(？ ) gram?
15,22.8 square meters? =? (? ) square meters (? ) square decimeter
Second, the judgment (15) ★
1, in (25? ×? 67)×? 4? =? 25? ×? 4? ×? 67 uses the distribution law of multiplication. (? )
What's the difference between 2.760 and 230 times 8? The formula is: 760? -? 230? ×? 8。 (? ) ?
3. Rewrite a larger number into a number in units of "10,000" or "100 million", and the original number becomes smaller. (? )
4、3600? ÷? 25? ×? 4? =? 36。 (? )
5、68? ×? 999? =? 68? ×? 100? -? 1。 (? )
6.3600 square centimeters? =? 3.6 square meters. (? )
7.distance? =? Speed? ÷? Time. (? )
8、40? ÷(60? -? 40)>(40? -? 25)×? 6。 (? )
9, 2.996 Keep two decimal places to be 3.00. (? ) ?
10、2583? ÷? 0? =? 0。 ()
Three. Selected (15 points) ★
1, when we draw a cuboid, we usually only draw three faces, because the cuboid (). ? First, only three sides; B, you can only see three sides; C, you can only see three faces at most.
2. The sum of the sides of a cube is 60 cm, and its surface area is (? )。 ? A, 2 1600 cm2; B, 150 cm2; C, 125 cubic centimeter
When the side length of a cube doubles, its surface area increases (? )。 ? A, 2 times; B, 4 times; C, 8 times; ? D, 16 times?
4. A rectangular frame with a length of 6 cm, a width of 5 cm and a height of 3 cm can be made with a long () iron wire. ? a、28cm； B, 126 cm2; c，56cm； D, 90 cubic centimeters
5. What is the comparison of surface area and volume of a cube with a side length of 6 decimeters? A, the same size; ? B, large surface area; ? C, large volume; D, the comparison size is not good
6. After dividing a cuboid into several small cuboids, the volume (? )。 ? A, unchanged; ? B, bigger than the original; C, smaller than the original;
7. If another factor of a score is enlarged by 3 times and the denominator remains unchanged, the score is (); If the numerator remains the same and the denominator is tripled, the score is (? )。 ? A, expand by 3 times; B, expand by 2 times; C, reduced by 3 times; D, shrink by 2 times
8. The simplest true score with a denominator of 6 is (? )。 ? a，6； b，5； c，4； d，3； e，2； ? f， 1
9. The quotient of numerator divided by denominator is 1, and the remainder is 1. This score is (? )。
A, true points; B, false scores; C, the simplest score? 1
0,10g salt is dissolved in 75g water, and salt accounts for brine (? )? a、 10/75； b、752/ 15； c、2/ 17； D, unable to determine
Fourth, the application question (4 1 minute)?
1. How many square decimeters of glass does it take to make a rectangular goldfish bowl (without cover) with a length of 8 decimeters, a width of 4 decimeters and a height of 6 decimeters? (4 points)
2. A room is 6 meters long, 3.5 meters wide and 3 meters high, with 8 square meters of doors and windows. Now, the walls and top of this room should be painted with cement. What is the area of cement painting? (4 points)
The length of a cube stone is 6 decimeters, and its weight is about 2.7 kilograms per cubic meter. How much does this stone weigh? (4 points)?
4. A tin food box with a length of 20cm, a width of15cm and a height of 30cm needs to be labeled. What is the area of this trademark paper? (4 points)?
A wall 80 meters long, 0.24 meters wide and 2 meters high needs 525 bricks per cubic meter. How many bricks does the school need to buy (4 points)?
A rectangular glass water tank can hold 60 liters of water. It is known that the glass water tank is 5 centimetres long and 3 centimetres wide. What is its depth? (4 points)?
7. There is a cubic iron block with a side length of 80 cm. Now it is necessary to melt it into a cuboid with a cross-sectional area of 20 cm. What is the length of this cuboid? (5 points)?
8. A city plans to build a rectangular gymnasium 60 meters long, 50 meters wide and 25 meters high.
(1) How much space does the gym occupy? (Ignore wall thickness) (4 points)?
(2) If a two-story auditorium is to be set up in the gymnasium, the auditorium is 50m long and 26m wide, each spectator's seat is1.8m long and1.2m wide, and the distance between the front and rear seats is 0.8m. At least 3m space is reserved above each seat. How many spectators can the stadium accommodate at the same time after it is completed as planned? (4 points)?
9. Pour 10 liter of water into a cuboid water tank with a length of 3 cm, a width of 2 cm and a height of 6 cm. ?
(1) What is the height of the water surface from the container mouth? (4 points)?
(2) If a stone is completely immersed in water, and the water surface is still 2.4 decimeters away from the mouth of the container, can you find out the volume of this stone? (4 points)?
People's education printing plate fifth grade mathematics volume unit 2 test questions answer 1, 15 points? 1、6、 12、8 ? 2、76、48、236? 3、28,50? 128, 1280? 4、4,? 5、 12a、6a？ 6、 100, 1? Second, 12 points? 1, wrong, 2, right 3, wrong 4, wrong? 3. 15? 1、B 2、A？ 3、B 4、C？ 5、A？ 4. 18? 1、288? 2、2 16? 3、3.52? 540? 1、 15.6 2、384 3、27 4、42. 1 ? Additional 79