Knowledge points:
1, mass unit: grams, kilograms and tons.
Master the quality units of grams, kilograms and tons. Feel the actual mass of grams, kilograms and tons, and be able to tell the mass of common objects in combination with specific situations. The relationship among kilograms, grams and tons and their simple conversion can solve simple practical problems. Master the relationship between kilograms, grams and tons, that is, 1 ton = 1000 kilograms, 1 kg = 1000 grams, and correctly convert between units. Understand the mass units of kilograms and grams, understand their actual mass, and establish the concepts of kilograms and grams.
2. Grasp the forward speed between kilograms and grams, and make simple conversion.
3. Through weighing, weighing and other activities, let students feel the weight initially, establish the concepts of kilograms and grams, and experience their respective weights.
4. Combining with practice, let students experience the application of grams and kilograms in life, and choose the appropriate weight unit for objects.
5. Cultivate students' ability to estimate their weight in activities. Including two aspects of ability, one is to choose the right weight unit, and the other is the accuracy of weight estimation.
6. Understand 1 kg = 1000 g, and learn simple conversion.
The kilogram can be labeled as "kg" and the gram can be labeled as "g". The formula can be written as 1 kg = 1000 g.
7. The same object can be expressed in different weight units, for example, a watermelon weighs 2(kg), or it can be said that this watermelon weighs 2000(g).
8. Through actual weighing, let students know several common weighing tools: balance, bench scale and electronic scale. Learn to use weighing tools to weigh objects.
What is the weight of 1 ton in the second quarter (I know tons)
Knowledge point: 1, perceive and know the mass unit ton, and know the actual mass 1 ton.
2. Master 1 ton =1000kg, and make simple conversion.
3. Improve the ability to estimate the quality according to the specific situation.
4. On the basis of the last lesson, improve the ability to estimate the mass of objects.
5. Take elephants and other common things in life as reference objects, and let students feel how much a ton weighs, thus establishing the concept of TON, which is represented by letters as "T".
Can distinguish the size of three weight units, and can be used flexibly to choose the right weight unit for the object.
Grasp the permeability between three area units, 1 ton = 1000 kg = 1000000 g.
Lesson 3: collocation learning
Knowledge points:
1. Make students master the orderly collocation methods and strategies in specific life situations.
2. Cultivate students' ability to think in an orderly way.
3. Through observation, guessing, hands-on operation, cooperation and communication and other situational activities, let students master the methods and strategies of orderly collocation in specific life situations.
4. Students use learning tools, draw matching circuit diagrams and draw tables to solve the matching problem. And abstract the orderly collocation method from it.
5. Cultivate students' ability to think in an orderly way, and let students develop the habit of thinking in an all-round way, without repetition or omission.
6. Cultivate students' awareness of solving mathematical problems in life through teaching, stimulate students' desire to explore mathematics in life, and cultivate students' awareness of learning mathematics.