The case of mathematics teaching in the first grade of primary school by People's Education Press I. Teaching objectives
1. On the basis of existing knowledge and experience, students can further experience the calculation process of more than ten MINUS nine through observation and operation, master the calculation method of more than ten MINUS nine skillfully, and can calculate correctly.
2. Encourage students to explore a variety of calculation methods through independent thinking and cooperative communication, and use their favorite methods to calculate the formula of more than ten MINUS nine, so as to infiltrate the ability of solving problems in a variety of ways.
3. The teaching case of "ten minus nine" in the second volume of mathematics in the first grade of primary school: guide students to use it? Ten MINUS nine? The new calculation method can solve practical problems, make students realize that there is mathematics everywhere in their lives, and thus cultivate students' awareness of using mathematics.
4. Cultivate students' sense of cooperation and communication skills.
Second, the teaching focus:
Guide students to solve practical problems with their favorite calculation method of ten MINUS nine.
Third, the teaching difficulties:
Experience and explore the thinking process of calculating more than ten MINUS nine.
Four, the preparation of teaching AIDS and learning tools:
Multimedia courseware, oral calculation card, stick
Verb (abbreviation of verb) teaching process;
Ten MINUS nine teaching plans
(1) warm-up match
8+9= 15-9= 17-9=6+7= 13-9=
7+9= 18-9=9+5= 14-9= 1 1-9=
(1) collective modification
(2) Comment: Please tell me how you worked out 17-9.
(3) Do students have different ideas about their own algorithms?
(4) Teacher: Just now, we reviewed several methods of subtracting nine from ten that we explored together, so the teacher hopes that everyone can do the questions in their favorite way in the future study process. Ok, let's enter our practice class of ten MINUS nine today. (blackboard writing topic: practice class with more than ten MINUS nine)
(2) Import:
Teacher: Do the students like Pleasant Goat?
Health: Yes.
Teacher: Teachers like it too. They are very happy to come to our classroom today. Let's say hello to them!
Health: Hello.
Teacher: The village head of Lanyangyang called everyone together early this morning and gave them an important task. It turned out that the wolf stole Yangcun's treasure while everyone was not paying attention. The task now is to find the lamb. Of course, there are many difficulties along the way. Are you confident to help them get their treasure back?
Health: Yes!
Teacher: OK, let's enter our competition.
1, high-speed combat
Teacher: Let's compare the speed with Pleasant Goat.
12-9 = 16-9 = 14-9 = 18-9 =
17-9 = 1 1-9 = 16-9 = 13-9 =
Use your favorite algorithm to calculate 18-9= ()
2. Look at the picture and write the formula
Teacher: Running so fast, everyone must be thirsty. Look, class, we are in strawberry fields.
3. Fight with great strength
Teacher: The students are full. Tiger brothers, Hercules, want to compete with us (circle with greater than, less than or equal to).
4+3 〇 17-9 15-9 〇5+97+8 〇9+6
4-9 〇 15-5 16-9 〇 13-9 12-9 〇9+4
4, mining war (want to add and subtract)
Teacher: Students should be careful not to step on mines.
9+( )= 12 9+( )= 18 9+( )= 159+( )= 1 1
12-9 = ( ) 18-9 = ( ) 15-9 = ( ) 1 1-9 = ( )
5. Look at the pictures and tell stories
Teacher: We walked safely through the minefield. Now let's take a break and tell a story.
(3) Activities
Teacher: Students, with the help of your intelligence, Pleasant Goat has successfully regained the treasure. Look, they came to thank us! To celebrate, they invited us to dance together. Are you ready? (Music: Finding Friends)
(4)
Teacher: Pleasant Goat has finished their task, and they are going back to Yangcun to continue their life. They want to buy some presents for everyone. Now please go to the supermarket to help them choose gifts!
(1) Mom gave it to you 16 yuan. What do you want to buy most, and how much money is left?
(2) If you could buy two kinds, what would you like to buy? How much is left?
(5)
After learning several calculation methods of ten MINUS nine, can you tell me how to calculate 15-8 and 13-7 in my favorite way?
(6)
Talk about harvest
What did you gain from this class?
Teacher: in this class, we learned a lot, such as telling stories, the calculation method of ten MINUS nine and so on. We also use the calculation method of subtracting nine from ten to deduce how to calculate eight from ten and seven from ten, which we will learn next time.
(7)
Teacher: Do you like Big Wolf?
Health: No, he is always doing bad things.
Teacher: Yes, the wolf always likes to sabotage, but the teacher thinks the wolf has one advantage. Although he failed every time, he never gave up. We should learn from him. Then this lesson depends on the wisdom of all of us Pleasant Goat defeated Big Wolf again and again. Grey Wolf failed again and again, and we won. We are pleasant goat!
Finally, the teacher gave the students a sentence: failure is the mother of success (big screen display)