Teaching objectives:

1. Understand the meter and its practical significance in observation and measurement activities, initially establish the concept of the length of 1 meter, master 1 meter = 100 cm, and carry out simple unit conversion.

2. Initially learn to measure the length of an object in meters (limited to whole centimeters), estimate the length of the object, and choose a suitable unit to represent the length of the object.

3. Experience the significance of measuring length in daily life in measuring activities.

Key points: the practical significance of rice and the relationship between rice and centimeter.

Difficulty: Choose a suitable unit to represent the length of an object.

Teaching preparation: PPT courseware and three-meter ruler.

First, the scene introduction:

1. Last class, we learned the unit of length-centimeter. How long is 1 cm? Can you tell your deskmate with your finger?

2. Summary