1.使学生认识常用的土地面积单位——公顷和平方千米。通过计算、观察、推

1. Make students understand the commonly used land area units-hectares and square kilometers. Through calculation, observation, reasoning and imagination, students can feel the actual size of 1 hectare and 1 square kilometer. <br>2. To enable students to grasp the rate of land area between units, know that 1 hectare = 10,000 square meters, 1 square kilometer = 100 hectares, and will be able to perform simple unit conversion. <br>3. Apply the area formula of plane graphics and the knowledge of area unit conversion to solve some simple practical problems, so that students can experience the connection and function of mathematics and real life, and enhance students' interest in learning mathematics.

1. Make students understand the common land area units - hectares and square kilometers. Through calculation, observation, reasoning and imagination, let students feel the actual size of 1 hectare and 1 square kilometer.<br>2. Enable students to master the rate of land area units, know that 1 hectare = 10000 square meters and 1 square kilometer = 100 hectares, and be able to carry out simple unit conversion.<br>3. Use the area formula of plane graphics and the knowledge of area unit conversion to solve some simple practical problems, make students realize the connection and function between mathematics and real life, and enhance students' interest in learning mathematics.<br>

1. Make students know the commonly used land area units-hectares and square kilometers. Through calculation, observation, reasoning and imagination, let students feel the actual size of 1 hectare and 1 square kilometer.2. To enable students to master the rate of progress between units of land area, and know that 1 hectare =10000 square meters and 1 square kilometer =100 hectares will be converted into simple units.3. Using the area formula of plane figure and the knowledge of area unit conversion to solve some simple practical problems, so that students can realize the connection and function between mathematics and real life, and enhance students' interest in learning mathematics.