Analysis:

1 km2 = 100 hectare

1 ha = 1 10,000 m2

1 km2 = 1000000 m2

Exercise questions:

First, fill in the appropriate numbers in the brackets:

8 hectares = () square meters 50000 square meters = () hectares 500000 hectares = () square kilometers.

50 km2 = () ha 1 km2 = () ha = () m2.

12 square meter 9 square decimeter = 65438 square meter +050 hectares = () square kilometer.

2 hectares = () square meters 5 square kilometers = () square meters

Second, solve the problem:

1. A parallelogram plot, 280m long and 50m wide. How many hectares is this land?

2. A trapezoidal wheat field with an upper bottom of 220 meters, a lower bottom of 280 meters and a height of 80 meters receives 48 tons of wheat, and how many tons of wheat is harvested per hectare on average.

A highway is 48km long and 50m wide. How many hectares is this highway? How many square kilometers.

4. A parallelogram land with an area of 3.9 hectares, with a height of 80 meters and a bottom of several meters.