1, 68 square meters = () square decimeter 9000 square centimeters = () square decimeter
() square meters =700 hectares = () square kilometers 500 decimeters = () meters.
4 square meters = () square decimeter = () square centimeter 3000 cm = () meter.
4 square decimeters = 50 square centimeters () square centimeters.
270,000 square meters = () hectares = () square decimeter
2. The surface of an object or the plane figure surrounded by it is called theirs.
3. The common unit of area is, and the common unit of land area is.
4. The calculation of perimeter is to find the total length of the plane figure surrounded by line segments, and the calculation of area is to find the plane figure surrounded by line segments.
5. Rectangles with the same perimeter have a larger area with a larger length-width difference.
6. When surveying land, generally use "0", "0" and other measuring tools to measure the short distance on the ground, which can be used or directly measured.
7. When the measurement result is not very accurate, it can be used.
8. When actually measuring the distance on the ground, the commonly used tools are, and.
.
When the length and width of a rectangle are equal, it becomes a rectangle.
10, the area of a rectangle is 80 square decimeter, the length is 16 square decimeter, and the width is.
1 1, the area of a square is 49 square centimeters, and its side length is.
12. Fill in ">", "
3 square meters, 40 square decimeters, 90 square decimeters, 9000 square centimeters, 50 decimeters and 6 meters.
700 square centimeters, 7 square meters, 5 square kilometers, 490 hectares, 3 hectares and 3,000 square meters.
Second, judge.
1. The area of the classroom is 50 square decimeters. ( )
2,6 square decimeters > 66 square centimeters. ( )
3. The square meters, hectares and square kilometers of these adjacent units are all 100. ( )
4. The length, width and area of the rectangle have been expanded by 4 times, 2 times and 6 times respectively. ( )
Make a rectangle or square with an 80-meter-long rope, and their areas are the same. ( )
6. Use nine squares with 1 cm2, and its area is 9 cm2, no matter what patterns are put together. ( )
Third, multiple choice questions. (Put the serial number of the correct answer in brackets)
In 1 and 1 hectare, there is () square land with a side length of 10 meter.
① 10 ② 100 ③ 1000
2. In a rectangle with eight small squares with a side length of 1 decimeter, the area () and the perimeter ().
① Equal ② Unequal
3. Wang 175 ().
① meter ② cm ③ decimeter
4. Cut the square with the side length of 1 decimeter into 100 small squares, and the side length of each square is 1 ().
① meter ② decimeter ③ cm
5. When the side length of a square is reduced by 4 times, its area is also reduced ().
① 10 ② 100 ③ 1000
6. Two rectangular paddy fields with an area of 1 hectare and a circumference of ().
① the same size; ② A is greater than B; ③ B is greater than a; 4 there is no contrast.
Fourth, the application problem.
1. The sides of a square are 4 decimeters and 5 millimeters. What is its area?
A 28 cm long iron wire forms a square. What is its area?
3. How many pieces can a piece of cloth 6 meters long and 3 meters wide be processed into a small square with a side length of 30 cm?
4. Square garden covering an area of 2 hectares, with a square flower bed with a side length of 50 meters in the middle and a lawn around it. What is the area of the lawn?
Shengli farm has a rectangular piece of land, 600 meters long and 300 meters wide. If one tractor can plow 2 hectares a day, how many days can three tractors plow this field?
6. Increase the side length of a group of opposite sides of a square by 12 cm. The area of this rectangle is three times that of the original square. What is the area of this rectangle?