Mathematics is the content of the first lesson of Unit 2 in the first volume of Grade Three. This lesson is after the students have finished learning it.
100
along with
Carry-in addition and carry addition of whole hundred plus whole hundred are the basis of teaching.
Lay the foundation for a class of three-digit plus three-digit continuous carry addition.
This unit teaches three-digit continuous carry addition, and the textbook is Statistics of Some Animal Species in China.
Table "leads to the teaching content and arranges two examples. The content of the first lesson mainly focuses on examples.
1
And exercise four groups.
Punish ... as an example to others
1
By asking how many species of birds and reptiles are endemic to China, this paper leads to
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You two
Number plus two digits, and sum is the carry addition of three digits. What if the ten digits are full? Immediately after
Write an example.
1
Textbooks appear in horizontal and vertical forms.
10
Go practice. Because before that, the students had already
perfect oneself in
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The written calculation and oral calculation of internal carry addition also have a certain understanding of the law of addition.
The content of this lesson is easy for students to master, and teachers should strengthen contact and reduce calculation.
Error rate. So I decided that the focus of this lesson is the calculation method of two-digit plus two-digit continuous carry addition.
Method, the difficulty is ten over ten to one hundred.
1
The writing format of the sum.
Based on the above understanding, combined with the new curriculum standards, I have determined the teaching objectives of this course:
Knowledge and skills
1
Master and understand the continuous carry addition of two digits plus two digits and three digits, and can calculate correctly.
Continuous carry addition of two digits plus two digits.
2
Cultivate students' ability to solve problems.
Experience the application of knowledge by forming a calculation method of adding two digits (continuous carry addition)
Knowledge transfer strategy.
Emotional attitudes and values
By letting students explore the calculation process of continuous carry addition independently, we can cultivate students' autonomous learning ability and stimulate their interest in learning.
Cultivate interest in learning and cooperation consciousness.
Combined with the above understanding, my teaching design ideas are as follows:
The class began to introduce oral calculation, and after listing a series of oral calculation questions in the form of oral calculation, oral calculation was carried out.
Arithmetic problems are divided into two groups, one is from one digit to ten digits, and the other is from ten digits to one digit.
Then guide the students to combine the two kinds of questions into a calculation problem, and lead to the continuous carry of two digits plus two digits.
Addition. Take one of them.
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For example, let students explore and collect independently in the form of group cooperation.
Report the results and calculation process. After that, exchange knowledge about exotic animals with the students and show the characteristics of China.
There is a statistical table of animal species, so that students can find mathematical information and ask mathematical questions in the statistical table; guide
Guide the students to solve "How many kinds of endemic animals, birds and reptiles are there in China?" According to the standard.
Let the students estimate first and then calculate, and exchange their different estimation methods. After estimation, calculate.