The second volume of mathematics in the first grade of primary school, Waste Reuse 1 teaching plan;
The second volume of mathematics published by Beijing Normal University, 30-3 1 page, solves less mathematical problems than Dobby.
Learning objectives:
1, combined with the practical problem of "more than less", further understand the significance of addition and subtraction.
2, in the operation of learning tools, can be correctly formulated and calculated.
Teaching emphases and difficulties:
1. Understand the practical problem of "much less than" and further understand the significance of addition and subtraction.
2, in the operation of learning tools, can be correctly formulated and calculated.
Teaching preparation:
Small blackboard, stick, language card wall chart
Teaching measures:
1, so that students can fully operate in teaching and clarify the relationship between quantity and quantity.
2. Abstract the calculation method of "more than less than" through business activities.
Teaching process:
First, stimulate the problem situation
Teacher: Students, what do you see in the teacher's hand? (Show me a battery)
Health: battery
Teacher: To be exact, this is a dead battery. It can be said that it is "waste" now.
Blackboard writing: waste
Teacher: Do you know? There are metals and waste liquid in waste batteries, which have a direct impact on soil, water and human health. A button-sized battery can pollute 600,000 liters of water, which is equivalent to a person's lifetime drinking water.
Teacher: Look at what the teacher has in his hand. (Plastic beverage bottles are shown).
Health: plastic beverage bottle).
Teacher: This is also "waste".
This kind of bottle will not rot after being buried underground for many years, which has an impact on crop growth.
Teacher: What measures should students take in view of this situation?
Think about it.
Health: recycling
Teacher: Good. (Re-board the book "Recycling". Recycling is a good method. Some recycled waste products can be reused, and those that cannot be used can also be treated beneficially. No, Xiao Lin, Xiao Hong and Xiao Qing have already taken action. Let's go and have a look. Show me the theme map. Today we are here to discuss some math problems.
Second, group cooperation, independent inquiry
Teachers organize students to observe: What information does the picture give us?
Students describe the given information in words.
Thinking: What math questions can you ask?
Group cooperation and communication.
Student representatives reported: How much did Xiaohong receive?
How much did Xiaoqing collect?
(If students propose a two-step solution, put it in the question bank. )
Teacher: The questions asked by the students are very good. How should we answer them? Let the students in the group talk and wave your stick.
Talk to the students in the group and wave your stick.
Teachers' patrol guidance.
Organize students to report.
Health: Put 23 Xiao Lin's, 6 little red ones are more than Xiao Lin's, and put 6 more. Results Xiao Hong is 23 plus 6 ***29, and the formula is 23+6=29 (1).
Swing a small harvest with a stick.
Tell me how it is set. How many Xiaoqing are there?
(Because 23-4 is abdication subtraction, students can release the result with a stick. )
Third, consolidate the practice.
1, practice the 1 question of "Practice".
Show me two boxes. The peanuts have been put in. There is a note in each box. Let two students go to the box.
Read the information in the two boxes separately.
Listen carefully and write down the information given in your notes.
One: I put 42 peanuts in my box.
Secondly, there are six more pills in my box than his.
What math questions would you ask?
Question: How many peanuts are there in the second box?
Guide the answer.
Wave it with a stick. Recursive calculation.
Let's talk about your ideas and how to solve them.
2. Practice the second question "Practice".
Introduce with a beautiful "paper crane".
Teacher: Look at this, class.
Health: Paper cranes.
Teacher: Students, do you know? Sending paper cranes is sending blessings. Smile and naughty are folding! Let's see what the math problem here is.
The small blackboard shows the problem: naughty folding 37 paper cranes. Smile and fold 12 as naughty.
How many laughs did you break?
Students understand the questions, discuss and say how to answer them.
Then write it down and solve it.
3. Show the oral card "Solitaire Practice" and complete the third question.
4. Complete Question 4: Guide the students to look at the pictures, ask math questions, organize exchanges and write the numbers of the formula.
Collective modification after completion.
Fourth, class summary.
Students, what have we gained today?
Students talk about their gains and shortcomings.
The teaching goal of the second teaching plan of the second volume of mathematics in the first grade of primary school, Waste Recycling;
1. Understand the practical problem of "more than one thing is better than less" under specific circumstances.
2. In the operation of the learning tool, the formula can be correctly formulated and calculated.
3. Cultivate students' awareness of cooperation and environmental protection.
Teaching emphases and difficulties:
By understanding the harm of waste plastics, the group can discuss and communicate independently, understand the problem that "more things are better than less things" and calculate correctly in the operation of learning tools.
Teaching process:
First, create an environment that arouses suspicion.
Teacher: Students, do you know the harm of waste products? Can you look at this picture and say what it means?
Show a picture of "waste recycling".
Second, interactive solutions.
1. Let the students talk about the harm and recycling of waste products.
Can you ask a math problem about the amount of waste plastic collected by three students in the picture? Can you solve these problems?
2. Let the students discuss in groups and explore the calculation method.
Teacher: The students did a good job. Can someone tell us something?
What questions did you ask? How did you solve it?
Third, inspire and guide doubts.
1. Can you show me the number of plastic bags collected by Xiaoqing? Formula sub-calculation.
Let the students know which number to compare with, what changes have taken place during the swing, and finally record the operation activities with formulas.
2. Look at the picture and do a calculation.
Fourth, practical application.
1. Do the math.
Xiaohong folded 42 lucky stars, Xiaoying folded 6 more than Xiaohong, and Xiaoying folded how many?
2. When donating books to Hope Primary School, Class One (1) donated 42 books, and Class One (2) donated 12 books, as many as Class One (1). How many books did Class One (2) donate?
3. calculation. 42+34、34+5、56-2 1、40+25、65-2、78-60、6+32、59-4、24+ 17
4. Look at the pictures, ask questions and write the formulas and answers.
(1) Elephant: I am taller than the deer 14 cm.
(2) Deer: I am 65cm tall.
(3) Rabbit: I am shorter than deer 1 1 cm.
(4) Panda: If I were 4 centimeters longer, I would be as tall as a deer.
Verb (abbreviation of verb) summary and evaluation
We asked two students to tell us what they learned today. Who wants to have a try?
The third teaching plan of "Waste Recycling" in the second volume of mathematics in the first grade of primary school;
Senior one, Waste Recycling, Volume II, Page 30-3 1.
Learning objectives:
Knowledge goal: Students should further understand the significance of addition and subtraction in the process of learning, combining with the practical problem of "less than more". In the operation of learning tools, students can correctly formulate calculations and consolidate the addition and subtraction of two-digit numbers (without carrying or abdicating).
Ability goal: to cultivate students' innovative consciousness in observation, to cultivate students' independent inquiry ability in operation, discussion and communication, and to improve students' computing ability in solving problems.
Emotional goal: through teaching, cultivate students' awareness of cooperation and environmental protection, improve students' interest in learning, and make students want to learn, enjoy learning and learn.
Teaching focus:
How to establish the connection between the actual situation and the meaning of addition and subtraction?
Teaching difficulties:
Cultivating students' ability to solve practical problems by addition and subtraction.
Teaching process:
First, create situations and introduce new lessons.
1. Teacher: Do children like going to the park? Then, the teacher will take everyone to the park. (Play the courseware) The scenery in the park is really beautiful. There are green trees, pavilions and artificial lakes ... what joy it brings to people! However, what did people leave for the park? Do you like this park now? Why? what are you going to do？
2. Title on the blackboard: Waste recycling
Second, hands-on operation, exploring new knowledge.
1. (Play courseware)
Teacher: Look, these three children have already started to act. They are collecting plastic bottles. Want to know who they are? Let them introduce themselves.
2. Play the courseware.
3. By name, what did you learn from the introduction of the three children?
4. According to this information, what math questions can you ask?
Health 1: How many plastic bottles did Xiaohong collect?
Student 2: How many plastic bottles did Xiaoqing collect?
5. Solve the first question-how many plastic bottles did Xiaohong collect?
(1) Find out: What mathematical information must be used to solve the math problem "How many plastic bottles does Xiaohong collect?"?
(2) Reading: Read the found mathematical data together with the questions.
(3) Give it a try: Students set up learning tools and try to list formulas.
(4) Calculation: Use your favorite method to calculate numbers.
(5) Teacher's summary: If the original number is required to be greater than a number, it is necessary to use addition, and how much is added.
6. Solve the second question-how many plastic bottles did Xiaoqing collect?
(1) What information must be used to solve the math problem "How many plastic bottles did Xiaoqing collect?"?
(2) Students independently list formulas, discuss and communicate at the same table, and talk about why they are listed like this.
(3) student reports.
(4) Teacher's summary: Oh, what is the number that requires less than a number? It should be calculated by subtraction. If it's less, reduce it by a few.
7. Compare the solution methods of the two questions, and further clarify the solution idea of the ratio less than the ratio greater than.
8. Why do we collect plastic bottles? Listen to what this wise old man has to say.
Plastic buried in the ground for many years will not "rot" and will endanger the growth of crops.
Third, hierarchical guidance and training to consolidate new knowledge.
(Show courseware)
1. Collect cans.
2. Collect old batteries.
3. Fold the lucky star.
Fourth, guide summary and strengthen new knowledge.
1. Teacher: Are you satisfied with today's class? What mathematical knowledge have you studied?
2. Students can answer freely.