()+() = (), you can also think of it this way: first calculate ()× () = (), and then add () zeros at the end of () to get ().

2, Xiaoli, Xiaofang and Xiaohong, every two people talk on the phone once, once * * * has to talk () times.

3. The area of a square with a side length of () is 1 cm2. For example, the area of a square with a side length of () is 1 cm2, and its area is 1 cm2. On the square ground of 1 m2, you can stand about 10-year-old students ().

4. The rectangle is12cm long and10cm wide. If the width is increased by () cm, it becomes a square.

5. Two squares of 1 square decimeter can be used to form a rectangle. The circumference of a rectangle is () decimeter and the area is () square decimeter.

6. The perimeters of a rectangle and a square are equal. It is known that a rectangle is 8 meters long and 6 meters wide, and the area of a square is () square meters.

7. Cut a square glass with a side length of 4 decimeters into two rectangles of equal size. The area of each rectangle is () square decimeter and the circumference is () decimeter.

The product of two numbers of 8 and the smallest three numbers is _ _ _ _ _ _ _.

9. When a number is divided by 34, the quotient is 2 1, and there is a remainder. This number is _ _ _ _ _ _ _.

10, let the quotient of □28÷4 be two digits, and fill in _ _ _ _ _ _ in □. If the quotient is three digits, at least fill in _ _ _ _ _ _ _ _ in □.

1 1, the quotient of the number a divided by the number b is 12, the number a is _ _ _ _ times that of the number b, and the sum of the number a and the number b is _ _ _ _ _ times that of the number b.

12, 150×6 can calculate _ _ _ _ _ _ first, and then add _ _ _ zeros at the end of the product, and the result is _ _ _ _ _ _.

13, the divisor is the division of one digit and the remainder is ().

14. Make a rectangle with three small squares with sides of 1 cm. The circumference of this rectangle is () cm and the area is () cm 2.

15, Xiao Ming measured the desk area with a piece of square cardboard 1 square decimeter. There should be six along the length, four along the width, and the area of the desktop is () square decimeter.

16. A rectangle is15cm long and 5cm wide. The area of this rectangle is _ _ _ _ _.

17. Paper flowers are made in labor class. Nickname made 2 red flowers and 4 blue flowers, with red flowers accounting for () and blue flowers accounting for ().

18. Divide 12 apples into 6 parts, each part is its () and 3 parts are its ().

19. Circle an 8-meter-long wire into a square. The side length of this square is (), the area is () and the perimeter is ().

1. The length of the rectangular flower bed is16m and the width is10m. Uncle Wang wants to fertilize the flower beds, with an average of 2 kilograms of nutritious water per square meter. How many kilograms of nutritious water does this flower bed need to be watered?

2. The new classroom should be equipped with window glass. Each piece of glass is 50 cm long and 40 cm wide. How many square decimeters is the area of each glass? How many square decimeters of glass do you need to buy to hold 64 pieces of such glass?

3. Three squares with a side length of 3 cm make up a big rectangle (as shown in the picture). What is the circumference of this rectangle? What is the area?

4.5 kilograms of soybeans can make 20 kilograms of tofu. According to this calculation, how many kilograms of soybeans do you need to make 120 kilograms of tofu?

Miss Li typed 240 words in 3 minutes. How many words can she type in half an hour?

6. To build the expressway, it is planned to build 6 kilometers a day and complete it in 40 days. It's actually 8 kilometers a day. How many days can it be completed?

7. Students watch the puppet show, with 22 seats in each row and 18 rows in one row. Is it enough for 350 students now? If there are enough seats. If there are not enough seats.

8. The fruit shop sent 24 boxes of fruits, 30kg each, which were sold to 28 yuan. How many kilograms are these fruits? How much can I sell it for?

9. Xiaohua reads 42 pages of books in 6 days. At this rate, how many days will it take to finish reading 84 pages?

10, Xiaoling uses square paper with an area of 1 square decimeter to measure the area of the desktop, placing five along the long side and five along the wide side. What is the desk area of this class?

1 1. A rectangular steel plate is10m long, 4m wide and weighs 8kg per square meter. How much does this steel plate weigh?

12. Meeting room length15m, width 8m, 2 people per square meter. How many people can sit in this conference room?

13. A rectangular vegetable field is 25m long and 8m wide. Now, the width is expanded to 12 meters. What is the area of this rectangle now? How much has the area increased compared with the original?

14. Tile a room 5 meters long and 3 meters wide. If there are 25 tiles per square meter, how many tiles does this room need to be paved?

15, the floor of a classroom is 8 meters long and 6 meters wide, with floor tiles and a side length of 2 meters. How many such tiles does a * * * need?

16. The circumference of a rectangle and a square is the same. If the side length of a square is 18 decimeter and the length of a rectangle is 24 decimeter, what are the areas of the square and rectangle respectively?

17, a square vegetable field with a side length of 17 m, can receive 40 kg of vegetables per square meter. How many Jin can this land accept?

18. In the final exam, Hailin scored an average of 90 points. She got 85 points in Chinese and 92 points in English. How many points did she get in the math exam?

19, Uncle Li enclosed a square piece of land with a 40-meter-long fence. What is the area of this land?

20. 3360 orange trees should be planted in the orchard. Plant one row for every 40 trees, and 62 rows have been planted. How many rows are left?