Related: Indonesia's newborn baby boy weighs 8.7kg >> Details ◇ The weight of truth >> Detailed Chinese teaching plan for children in large classes-poetry teaching >> Details ◇ Interesting mathematics in senior two: whose body >; & gt Detailed design intention: This activity comes from children's life and embodies the educational idea of respecting children's development and making children the initiative of learning and the main body of activities. According to the age characteristics of children in large classes, children in large classes are more and more interested in playing and operating, carrying out simple activities such as comparison, classification, measurement and judgment, especially interested in the weight of different items in the surrounding life, and like to try to compare and find their differences. In view of this feature, I designed this activity, aiming to let children learn to compare the weight of objects by natural measurement, judge the weight of objects by visual inspection, manual weighing and using simple instruments (rubber bands) in daily life, perceive the relativity of the weight of objects, and develop children's perception and judgment ability. Teaching objective: 1. Through the operation of objects, let children experience the lightness and heaviness of objects and feel the relativity of lightness and heaviness of objects. 2. Now we can compare the weights of objects with simple methods and describe the weights of objects with correct language. Teaching preparation: a big apple and a small apple, football and bubble balls, shoe boxes for putting different things, some objects for children to operate, and rubber bands. Teaching process: 1. Compare with the teacher: Now who can tell which of the two items in the teacher's hand is heavier and which is lighter? (big apples and small apples; Football and Bubble Ball) Teacher: Why can you tell at once? Conclusion: This is because we have taken it in our daily life, so we can directly see which is heavier and which is lighter with our eyes. Second, think about the teacher: teacher, here are two boxes of the same size, which contain different things. We can't see the weight with our eyes. Do you have any good way to compare the weights of these two objects? Teacher: The children have come up with many good methods, so today we will compare the lightness and heaviness of objects in our own way. Teacher: Just now, the children all thought of many good ways. Now who wants to come up and feel which of the two boxes in the teacher's hand is heavier? Which is lighter? Tell everyone how you feel. (Let the children weigh up and get the answer) 2. Well, there are many things I want to compare with their weight. The children are divided into four groups, and each group has the same three projects. Let the children compare who is lighter by weighing themselves. Who is heavier than who? After the comparison, please send a representative to talk about the results. (Requirements: Each group of children compares and tells the weight of three objects by weighing. Perceiving the weight of an object is relative. ) 3. Teacher's summary: The weight of objects is relative. For an object heavier than him, he is light; For an object lighter than him, he is heavy. Hang a crane 1. Teacher: (Showing two bottles) It seems impossible to estimate the weight of these two bottles by hand. Do you have any good way to compare their weights? (Hang it with a rubber band to compare the weight) Teacher demonstrates: Which length should I look at? (Rubber band length) Please come up and point out the stretch length of rubber band. The teacher concluded: The heavier the object hung on the same rubber band, the longer the rubber band will be stretched. The lighter the suspended object, the shorter the rubber band is stretched. 5. Observe the experiment, compare lightness and heaviness, and further perceive the relativity of lightness and heaviness. 1. The teacher shows that four bottles contain different things. Teacher: Now let's choose two of these four bottles and weigh them by hand or hang them with rubber bands to see who is lighter and heavier. And record it. 2. The teacher explains the operation requirements. 3. Children begin to operate and record. 4. The teacher summarizes the records. Who is the heaviest? Who is the lightest? Who is heavier than who, who is lighter than who? Activity extension: provide rich and operable materials in the regional activity area for children to further explore experiments.