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Third grade mathematics problem: to give 8 meters long, 6 meters wide classroom floor tiles, there are two types of floor tiles: 40 cm square tiles and 60 cm long, 40 cm wide rectangular tiles?
Floor area of Classroom: 8 * 6 = 48 (square meters) = 480000 (square centimeters)
Area of each square tile: 40 * 40 = 1600 (square centimeter)
Area of each rectangular floor tile: 60 * 40 = 2400 (square centimeter)
Number of square floor tiles: 480000 △ 1600 = 300 (pieces)
Number of rectangular floor tiles: 480000 △ 2400 = 200 (pieces)
How many tiles do you need at least to pave a 18 meter long and 5 meter wide sidewalk with 25 cm square tiles?
25cm = 0.25m, 18 × 5 ^ (0.25 × 0.25) = 90 ^ 0.0625 = 1440 (pieces); a: at least 1440 such tiles are required
Dad wants to lay tiles on the floor of the rectangular living room. It is known that the length of the living room is 5.6 meters and the width is 4 meters. How many square tiles with a side length of 80 cm are needed at least
The area of the floor of the living room is: 5.6 × 4 = 22.4 (square meters). The area of this kind of floor tile is: 0.8 × 0.8 = 0.64 (square meters) (80cm equals 0.8m). The formula is: 5.6 × 4 ^ (0.8 × 0.8) =
Use 11 square with side length of 8 decimeters to form a rectangle. How many decimeters is the perimeter and area of the rectangle?
11 × 8 = 88 decimeters
(88 + 8) × 2 = 192 decimeters
88 × 8 = 704 square decimeters
RELATED INFORMATIONS
- 1. Divide a square with a perimeter of 8 decimeters into two identical rectangles, each of which has a rectangular area of______ Square decimeter, perimeter is______ Decimeter
- 2. The perimeter of the rectangle is 19.4 meters. The length is 0.8 meters less than twice the width. How many meters are the length and width of the rectangle?
- 3. The circumference of a rectangle is 24 meters, and its length is four times of its width. How many meters are the length and width of the rectangle? Use the equation to calculate
- 4. The perimeter of a rectangle is 48 meters, and the ratio of length to width is 2; 1
- 5. When the length and width of a rectangle are expanded three times at the same time, the perimeter is 72 cm. How many cm is the perimeter of the rectangle?
- 6. The circumference of a rectangle is 36 cm, and the length is 10 cm. The simplest integer ratio of length and width is______ ．
- 7. The circumference of a rectangle is 100 decimeters, of which the width is 10 decimeters less than the length What's the area of this rectangle?
- 8. If the length of a rectangle is 12cm and the diagonal length is 13cm, the perimeter of the rectangle is______ cm．
- 9. A rectangle is 5 / 3 decimeters long and 4 / 1 longer than its width. How many decimeters is the circumference of the rectangle (4 / 1 is 1 / 4, and so on)
- 10. Use four identical rectangles to make a square. The circumference of each rectangle is 50 cm. What is the square area? A formula
- 11. A rectangular floor tile is 42 cm long and 26 cm wide. How many floor tiles does it need to make a square floor? Urgent need~
- 12. A cuboid swimming pool is 20 meters long, 15 meters wide and 2 meters deep. Now we need to put cement on each side of the swimming pool, and then paste ceramic tiles with a length of 4 decimeters. How many such tiles are needed? If 5 kg of cement is used per square meter, how much cement will be used?
- 13. A cuboid children's swimming pool is 40 meters long, 14 meters wide and 1.2 meters deep. How many pieces of square tiles with an area of 0.16 square meters need to be pasted on the four walls and the bottom of the pool?
- 14. The swimming pool of a school gymnasium is 50 meters long, 20 meters wide and 1.2 meters deep. How many tiles are needed to paste 0.16 square meters of tiles on the wall and bottom of the pool?
- 15. There is a rectangular living room, 6.4 meters long and 4 meters wide. It needs to lay 80 cm square floor tiles. How many floor tiles do you need? If each tile costs 35 yuan, how much does it cost?
- 16. How many centimeters is the diagonal of 80 cm square tile?
- 17. It takes 520 pieces to use a square with a side length of 20 cm to pave the floor. Now we use a rectangle with a side length of 20 cm and a width of 10 cm to pave the floor with a square with a side length of 25 cm. How many pieces do we need at least?
- 18. As shown in the figure, the 50cm wide rectangular pattern is composed of 10 congruent small rectangles, one of which has an area of () A. 400 cm2B. 500 cm2C. 600 cm2D. 4000 cm2
- 19. As shown in the figure, in square ABCD, f is the midpoint of AD, BF and AC intersect with point G, then the area ratio of △ BGC to quadrilateral CGFD
- 20. In the parallelogram ABCD, CE ⊥ CD is passed through point C, ad is crossed with point E, and the segment EC is rotated 90 degrees counterclockwise around point e to obtain the segment EF