First, the teaching objectives
(1) Knowledge and skills:
1. Make students know the weight unit of tons and the application of tons in practice, and initially establish the concept of 1 ton, knowing that 1 ton = 1000 kg.
2. Simple conversion between weight units can be performed.
3. Cultivate students' observation ability, weight estimation ability and reasoning ability, and develop their spatial imagination ability.
(2) Process and method:
Make students experience the process of learning mathematics such as observation, operation experience and inductive reasoning, and feel the rationality of mathematical thinking process.
(3) Emotion, attitude and values:
1. With the encouragement and help of others, I am curious about some math-related things around me and can actively participate in vivid and intuitive math activities.
2. Be able to overcome some difficulties encountered in mathematics activities, gain successful experience and establish confidence in learning mathematics well.
Second, the teaching process
(A) teaching mode, methods and strategies
This class adopts the double-subject cooperative teaching mode, and teachers use modern teaching methods to create situations and mobilize students' learning enthusiasm. Let students actively participate in learning, provide students with opportunities for autonomous learning to the maximum extent, let students feel, experience and master new knowledge in exploration, and link what they have learned with life and Chinese learning, so as to truly realize the integration of mathematics with Chinese and life.
(2) Specific content
1. Introduce the situation and stimulate interest.
Look at the projected dinosaur first and talk about it: What kind of animal is this? Are you familiar with them?
Can you briefly introduce a dinosaur that you are familiar with? Show 1 dinosaur again. Q: What's the weight of this dinosaur? (1 ton) and then ask: What do you want to know about 1 ton?
(Projection introduction, situation creation. Let students talk about what they want to know, which highlights students' dominant position and stimulates their desire to explore new knowledge. )
2. Feel the experience and explore new knowledge.
(1) The computer shows the image of Ton and gives it life. Display 1 bag of 50 kilograms of rice, 20 bags of tons. It reveals the application of tons in life, and makes it clear that 1 ton = 1000 kg.
With the help of visual demonstration, we can understand mathematics and mathematics in life and stimulate students' interest in exploring new knowledge. )
(2) Ask two students to move 50kg 1 bag of rice and ask: How many times do you want to move 1 ton of rice?
(Students experience it by themselves, and then demonstrate it intuitively, so as to fully arouse the enthusiasm of students for hands-on operation. )
(3) Let the students show the pre-class survey, that is, the weight table of the students in the golden class. Take a student who weighs close to 25 kg as an example, and see who in Jin class weighs close to 25 kg. Q: How many students are there about one ton? (Let the students estimate and answer 40) Then let 40 students come out, arm in arm, jump together and feel the sound of 1 ton falling.
These activities cultivate students' ability to collect information, and in this practice, not only students' estimation ability and exploration ability have been exercised and improved, but also students' emotional experience has been developed harmoniously. )
(4) Students read by themselves and communicate their understanding of tons in groups.
(5) Students question and solve doubts.
(6) Work in groups to find out the relationship between tons and kilograms by various methods.
Let every student participate in the activity, and everyone will experience the joy of success. )
(7) Make a sentence in the form of "... is ... kg, ... is 1 ton".
Let students think positively. Excavating tons of problems in life not only deepens students' understanding of knowledge, but also broadens their thinking. At the same time, it also trains students' language expression ability. )
3. Expand your understanding. Deepen the impression.
Think about what numbers should be put in brackets next to each picture below. Its weight is 1 ton. )
(2) The computer displays two truck drawings. The load capacity of small trucks is about 1000 kg, and that of large trucks is about 5 tons.
Q: Can you change the wording of these two sentences to keep their meanings unchanged?
(3) Show two pictures of animals. The elephant weighs 4 tons, and the whale is three times as heavy as the elephant. Can you ask a math question to test everyone?