"Knowing centimeters" is the content of compulsory education curriculum in the second grade of primary school mathematics. Ask students to experience the process of measuring the length of an object in different ways, using "Why do they say different numbers?" Stimulate students to think and understand the necessity of establishing a unified measurement unit.

According to the requirements of the course, students should know the scale of meters, know that shorter articles can be measured in centimeters, and form the appearance of centimeter length through learning activities such as watching, measuring and drawing.

Teaching objectives

1, combined with real life, experienced the process of measuring the length of an object with different methods, and realized the importance of establishing measurement units in measurement activities.

2. Through observation, operation and other activities, I have preliminarily understood the length unit centimeter, preliminarily established the appearance of centimeter, and preliminarily learned to measure the length of line segments.

3, can estimate the length of some objects and measure, develop the concept of space.

4. Cultivate the preliminary practical ability, so that it can further feel the mathematical facts in life.