1. What math picture books/stories have you read?

2. The teacher looks at picture books, design drawings and ropes.

Let students realize that when students have contradictions, they should pay attention to the way of communicating with others.

Health: In order to prevent sheep from entering other people's grasslands, the grasslands can be enclosed.

3. "Leave a door" → "Close the door"

(1) Let students understand that "the length of the closed graphic boundary is the perimeter."

(2) Let students understand "closed figure" and "boundary"

Teacher: "Is the prince at the border? Are two herders at the border? Is the cat in boots at the border? "

The comparison shows that the end-to-end connection is a closed graph.

4. The teacher refers to the cover of the math textbook: more than a week, less than a week.

Determine whether it is a perimeter.

5. Draw the palace map → Measure the courtyard (you can enclose it with rope).

6. Explore the characteristics and perimeter of the rectangle.

1. First, compare the open sheepfold and the closed sheepfold, so that students can understand the closed graphics.

2. Then show the definition of perimeter: perimeter is the length of a closed figure.

3. Animation setting: the ends are connected and the word "tail" moves with the line.

4. The focus of this lesson is the perimeter, which needs to be highlighted, and the study of the course should return to the theme.

(1) Explore the measurement of courtyard (irregular figure), and infiltrate the bending idea into straightness, or prepare oval cardboard and meter ruler, so that students can measure the length by "rolling".

(2) Explore the perimeters of two palaces: Because both figures are surrounded by straight edges, let students feel that the perimeters of regular figures are the accumulation of the lengths of each edge.

5. When judging whether it is a rectangle, the teacher can refer to: within a week, more than a week, end to end but not a rectangle (triangle).

6. Blackboard design: The blackboard on the left can not only show the definition of perimeter, but also show the concept of perimeter. On the blackboard on the right, you can write and paste the method of measuring perimeter and two special graphics.

For example:

1. Moral education achievement: Students say to be calm when quarreling. ...

It seems that you have learned how to get along with your classmates. ...

2. Harvest of mathematical knowledge: You are really like a little mathematician, and you have gained so much!

3. Summary:

It seems that you have learned mathematics knowledge from picture book stories. Mathematics is like this, it comes from life and is applied to life. We should have a pair of discerning eyes ...

Each student gains something, but it's really amazing. Share the harvest with your parents after class. We will study together in this class and look forward to seeing our classmates again.