1. Objectives:
1.Learn to compare the thickness of objects and be able to express the results correctly.
2.You can sort objects from fine to coarse, and you know that thickness is relative.
2. Preparation for the event
Material preparation: a number of Wangzi denim jars, straws, building blocks, sausages, markers, candles, etc. of different thicknesses; Courseware ppt; Young children manipulate materials.
Third, the process of the activity:
1.Explore and discover the thickness.
1) Play around and find out the thickness.
Teacher: Today, Mr. Lin has brought you some things, let's see what they have? (*Teacher Qu's lesson plan) Later, please take a look, touch it, and talk to the children next to you, what are the differences between them?
Children can freely choose materials to explore, and teachers will guide them.
2) Discuss and guide children to communicate and share.
Teacher: Now, who wants to tell me what differences you have found in the process of playing? How did you find out?
3) Summary. Teacher's summary: Oh, you have all discovered that some of these things are thick and some are fine. To know whether it is thick or thin, in addition to seeing it with your eyes, you can also insert it, stack it, and compare it with your hands. You're all great! So what is thick and what is thin? Let's take a look.
2.Compare and judge the thickness.
1) Compare the thickness of the object and know that the thickness is relative.
The teacher first showed the red and green bricks of different thicknesses for comparison.
Teacher: Let's first take a look at this red building block, do you think it is thick or thin? Let's ask the green bricks to help out and compare with it.
Continue to show the blue bricks and the green bricks for comparison to know the relativity of thickness.
Teacher: Hey, why is it that the red blocks are thicker than the green blocks just now, and now the red blocks are thinner than the blue blocks? Who knows why? You can discuss it with the child next to you.
2) Compare the thickness of the three objects to find the coarsest and thinnest.
Teacher: Now, let's put these three blocks together and compare them, which one do you think is the thickest and which is the thinnest?
3) Summary. Summary: Through comparison, we know three secrets of thickness. First, there must be at least two things to compare the coarse and the fine, and the same thing alone cannot be compared; Second, compared with objects of different thicknesses, the results are different, and the thickness and fineness are relative; Third, three or more kinds of objects are thicker and thicker, and the coarsest and thinnest can be compared.
3.Sort by thickness difference.
The teacher presents the PPT courseware.
1) Guide children to understand the sorting of marker charts from fine to coarse.
Teacher: Children, the little eyes have come here, and the teacher has brought you a **, please think about what it means?
2) Children can freely choose objects and line them up in order from thin to coarse.
Children operate freely, and teachers guide them.
Teacher: Please take each of you and line them up in order from thin to coarse, or you can work with two people. Now, please walk gently to the side of the material and line up in a row.
Individual questions. Teacher: Can you tell us how you lined up? What do you do first?
3) The method of lining up from fine to coarse in the common summary of teachers and children.
The teacher operates the PPT courseware while speaking.
Summary: The first method is to find the thinnest of the 4 cylinders and put them on the left, then find the thickest ones on the far right, and then compare the remaining two and line them up in order. The second method is to find the most detailed first first; Then find the thinnest one and rank second; Use only this method in turn.
4.Group action activities.
Teacher: "I have prepared four materials for you, let's take a look." ”
1) The teacher introduces the operation materials.
Material 1: Find out the items in each ** and hit " " in the square at the bottom
Material 2: Find the thickest and thinnest objects in each ** and paint them red and green in the circles below them.
Material 3: Three straws of different thicknesses are provided, lined up from fine to coarse.
Ingredient 4: Provide plasticine for children to roll out three "noodles" of different thicknesses and sort them from fine to thick.
2) Children's operation, teacher tour guidance.
Teacher: Now please pick up a small chair, gently sit next to the material you like, compare them with each other, and row them up.
Teachers inspect and guide, focusing on guiding children to sort thickness.
Focus on instructing children to sort thickness.
5.Children are free to end the activity.
Teacher: Children who are compared can drink water and go to the toilet. Goodbye kids! (This lesson plan contains supporting PPT courseware).
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