认识克与千克（Recognize grams and kilograms）.doc

认识克与千克（Recognize grams and kilograms） The teaching record of gram and kilogram Zhang Li, Jianshe Road elementary school, Yingze District, Taiyuan, Shanxi First, the introduction of new courses Teacher: do you like to play games? (1) carrying one back Teacher: lets play a back and one back game, ask three students to come up, let one of them recite one by one and the other two students, and then tell all of you how you feel. (living, division, help) Student: XX is heavier, XX is lighter. T: it seems that our bodies are divided into two parts. (two) a weigh Teacher, please a weigh pencil box and your math book, put your feelings in the group say. (living alone, talking to each other, reporting) Student 1: I think the pencil case is heavier than the book. Student 2: I think its the same weight. (three) introducing the subject T: it seems that objects are of equal importance. So, what units do you know to indicate the weight of the object? Sheng: there are Jin, kg, G, kg, two, tons and so on. T: so what do you know about the units that mean weight in our country and in other countries in the world? Its grams and kilograms. Two, the new grant (1) contact life, find grams and kilograms T: So where have you all seen grams and kilograms? Student: in small food, fine grain. The division produces various items such as soybean milk, biscuits, washing powder, flour, etc. T: weve all seen grams and kilograms. How heavy is 1 grams and 1 kilograms? (two) perceive 1 grams, 5 grams and 10 grams T: this 2 cent coin is about l grams. Please ask the group leader to pour out your school tools. Each person will take l coins, feel 1 grams, and speak to each other in the group. Students began to weigh coins, said, feeling. Student: 1 grams is very light, with no similar. T: then, can you try to find something else weighing 1 grams? A weigh each other. (health report, two pins, two clips, 4~5 soybeans, etc.) T: How did you find out? 1: on the one hand weigh a. 2: first weigh coins, and then