(1) Two identical right-angled trapeziums can be combined into a rectangle. If the length of a rectangle is 12cm and the width is 8cm, then the area of each trapezoid is () cm2. If the area of each trapezoid is 30 square centimeters, then the area of the rectangle is () square centimeters.

(2) Xiaohua walks 200 meters to the east, marked as +200 meters, then -300 meters is () meters.

(3) A trapezoidal land, the upper bottom is 30m long, the lower bottom is10m long and the height is 20m. Its area is () square meters.

(4) The area of a triangle is equal to that of a parallelogram, and the bases are equal. If the height of a triangle is 12 decimeter, then the height of a parallelogram is () decimeter.

(5) Fill in the appropriate units in ().

The area of a class desktop is 36 (), and the land area of our country is about 9.6 million ().

The distance from Shixiao to Vantage is 560 (). Wanshan Park covers an area of about 15 ().

(6) A triangle is equal to the base and height of a parallelogram. If the area of parallelogram is 24 square centimeters larger than that of triangle, then the area of triangle is () square centimeters.

(7) Each square in the figure below represents 1 cm2. Count and fill in. The area of leaves is at least () square centimeters and at most () square centimeters, which is about () square centimeters.

(8)5 100 square decimeter = () square meter

50 decimeters = () meters 160000 square meters = () hectares 36 hectares = () square meters 15000 hectares = () square kilometers.

(9) There are two cold storages, one is-18℃, the other is -20℃, and the next one is ().

Choose the correct answer number below and fill in the brackets. (20 points)

(1) There are () negative numbers in -8,-7,0,+100, -3 12, 120.

a、 1 B、2 C、3 D、4

(2) In the following two identical rectangles, compared with the area of the shaded part, a () b.

A, greater than B, less than C and equal to D, can't be judged.

(3) The height of the parallelogram is unchanged, the base is enlarged by 4 times, and the area is ().

A, constant b, 4 times larger than c, 4 times smaller.

(4) The height of the left parallelogram is 4cm and its area is ().

a、 15cm2 B、 12 cm2 C、20 cm2

(5) The temperature in the early morning is -5℃, which is 6℃ higher than that in the early morning at noon, and the temperature at noon is ().

a 、- 1℃ B、 1℃C、 1 1℃

(6) The bases of the two triangles are equal and the heights are equal, indicating that the two triangles ().

A, the same shape b, the same area c, of course, can be spelled into a parallelogram.

(7) Draw a new triangle in a parallelogram with an area of 42 square meters. The area of this triangle is () square meters.

a、2 1 B、30 C、 14

(8) Cut out the same triangle with a rectangular piece of paper (as shown on the right).

You can cut out at most () such triangles.

a、 10 B、20 C、2 1

(9) Pull a parallelogram moving frame into a rectangle, then compare the original parallelogram with the current rectangle ().

A perimeter remains the same, area remains the same, and B perimeter changes, area remains the same.

The perimeter is unchanged and the area changes.

(10) Among the following statements, the wrong one is ().

A. The base and height of two parallelograms with equal areas are not necessarily equal.

The area of a triangle is half that of a parallelogram.

C, 0 is neither positive nor negative.

D in life, profits are generally represented by positive numbers, while losses are represented by negative numbers.

3. Draw a parallelogram, a triangle and a trapezoid in the grid diagram below, so that their areas are equal to the area of the rectangle in the diagram. (12)

Fourth, solve practical problems. (3 1)

1, triangular orchard, base 150m, 40m high. How many fruit trees can be planted in this orchard if each fruit tree covers an area of 6 square meters?

2. The experimental primary school is going to make a team flag for each class in the new semester (as shown below). How many square decimetres does it take to make such a team flag?

3. Trapezoidal billboard (with the same contents on both sides), with a top and bottom of 4m, a bottom of 6m and a height of 2m. If the advertising production cost of this advertising company is 20 yuan per square meter, how much is this billboard?

4. parallelogram paddy field, with a bottom of 200m and a height of 150m. If 300 kilograms of fertilizer is applied per hectare, how many kilograms should this paddy field be fertilized?

5. As shown in the figure, there is a lawn below and two walkways with a width of 1 m in the middle. Find a place to grow grass. (5 points)

6. As the picture shows, a trapezoidal chicken farm is surrounded by a bamboo fence. On one side of the site, the fence of the house is used, with a total length of 90 meters (as shown in the figure).

(1) What is the area of this chicken farm? wall

(2) If there are 3 chickens per square meter, how many chickens can this chicken farm raise?