The first teaching content:
P25~P26
Teaching objectives:
1. Stimulate students' interest in reading and writing numbers through "dialing", "counting" and math activities.
2. Through the practice of this lesson, students can further master the order of books within 10,000, and can count and read books within 10,000.
Teaching preparation:
Counter, learning tool counter
Teaching process:
First, review.
1, today we continue to learn dialing and counting.
Talk about what to pay attention to when reading and writing numbers.
Second, recognize a wave.
Read page 24 to understand the historical structure of abacus and further understand the numerical order.
Third, practice.
1. Complete the second question on page 25.
(1) deskmate cooperation: one classmate dials and the other reads.
(2) Fill in the blanks in the book.
(3) After the students have finished speaking, teachers should educate the students in patriotism and humanistic spirit.
(4) Students perform on stage. And tell me why.
Step 2 give it a try
(1) Look at the contents of the book and talk about your understanding of 2 128.
(2) Are there any different expressions?
(3) What do you mean by communication?
(4) Imitate the example and say it.
3. Complete the 1 questions on page 25 of the book.
4. Play math games: Who is the first?
Look at the picture and say what you see and what information you get.
(2) How to calculate how many points the smart dog got?
(3) Calculate how many points you are naughty in the same way.
(4) Tell me who is the first.
Four. abstract
What did we learn in this class?
V. Classroom assignments
1, count from 980 to 150.
Count back from 1200, one by one, and count to 996.
Blackboard design:
2 128=2000+ 100+20+8
Counter representation
block representation
The second teaching content:
Page 32-35 of the textbook for the second grade of primary school mathematics published by Beijing Normal University.
Teaching material analysis:
The textbook has arranged four "dials", the first and the second, combining counting, reading and writing, highlighting the practice of numbers close to whole hundred and whole thousand, covering the reading and writing methods of numbers with a 0 in the middle and a 0 at the end; The third disc mainly practices the reading and writing methods of numbers with two zeros in the middle and zeros in the middle and at the end. The fourth exercise is to leave the counter and practice reading and writing in the form of "I read and you write" game.
Teaching objectives:
(1) Stimulate students' interest in reading and writing numbers through activities such as "dialing", "counting" and "math games".
(2) With the help of a counter, learn how to read and write multiple digits, and know the number sequence within 10,000.
Teaching emphases and difficulties:
(1) can count, read and write numbers within 10,000.
(2) Reading of multi-digit numbers with a middle ending of 0.
Teaching process:
First, review.
(1) Let the students talk about the number sequence table: from the right, the first digit is one digit, the second digit is ten digits, the third digit is hundred digits, the fourth digit is thousand digits, and the fifth digit is ten thousand digits.
(2) the relationship between the counting units:
10 one is ten, 10 ten is one hundred, 10 one hundred is one thousand, 10 one thousand is ten thousand.
Second, the introduction of new courses.
Third, new funding.
(1) Study 298
1, dial it.
Tell me how to dial 298.
Health; Two hundred means there are two hundred numbers to dial, ninety means nine to ten to nine, and eight means eight to eight.
2. Learn how to write 298.
How to write the numbers on this counter?
Health; If you are two in a hundred, write 2 in a hundred, 9 in ten and 8 in digits.
(2) Learn to count from 298 to 302.
1, next student number is 298.
What's the next number of (1)298?
Health; It's 299,
Division; Why? Because the next number of 298 is the unit of 298 plus 1, which is 299.
(2) Learn how to write 299,
Write two as a hundred, two as a hundred, nine as ten, nine as numbers, and nine as numbers.
(3) Learn how to read 299.
Hundreds of people read two for two hundred, ten for nine for ninety, and one for nine for nine.
The next student number is 299.
(1) dial.
Teacher 299, the next number is a lot.
Health; The next number of 299 is 300.
Division; Why? Because you add 1 to the digits of 299 and find that all digits are ten, you have to divide one into ten, so you can divide one into ten. Returns ten beads at this position.
Ten people entered one. What did you find?
Health; Ten is all ten,
Division; What to do?
Division; Take one as a hundred, first remove ten beads from ten, and take one as a hundred. The next number of 299 is 300.
(2) Write
How to write 300?
Health; It's three hundred and three hundred.
Division; How to write "10" and "10",
Health; There are no digits in digits and tens, and both are written as 0.
(3) read it.
Division; Someone has read it.
Health; three hundred
Division; In the hundreds, three is pronounced as three hundred. Did you see the zero at the end? Teacher. The 0 at the end of the number will not be read.
3. The number of studies is 30 1
(1) Go ahead.
What's the next number of 300?
Health; The next number of 300 is 30 1.
Division; ; The next number of 300 is 30 1.
The next number of 300 is the counter plus 1, so it is 30 1.
(2) Write
Division; How to write this number?
Health; If the digit is three, the digit is three; If there is no single bead on the digit, the digit is 0, the digit is 1 and the digit is 1.
(3) read it. 30 1
Division; Who can read this number?
Health; Three hundred and one, three percent, pronounced three hundred. In the middle ten digits, there is zero reading, one digit, one reading, one reading.
So this number is read as 30 1.
4. Learn how to read and write.
Summarize; Just now, we learned to count one by one. When the number reaches ten, we make one into ten, make ten full, and make one into a hundred.
(2) Learn to dial 38 1 1 100 to 4 100.
1, think about it, 3800, how to dial,
(1) 3,000 dial thousands with three beads, 800 with hundreds with eight beads, and none with one or ten.
(2) write and write; How to write this number?
Health; Starting from the high position, three in a thousand is three in a thousand, and eight in a hundred is eight in a hundred.
Division; What about tens and digits? If there are no numbers in the tens and digits, write 0.
(3) read it again,
Division; Who can read this number?
One digit is 3, which is pronounced as 3000, and one hundred digits is pronounced as 8, which becomes 800.
Division; What about the two zeros at the end,
Health; The zero at the end is not read.
2. From 1 100 to 4 100.
Know what the next number of 3800 is,
The number of 1 100 is 3900 plus 1.
(1) write. Who can write this number? Write the numbers first.
Three thousand, three thousand, nine hundred, nine hundred. There are no ten-digit and one-digit numbers. If you write something, write 0.
(2) reading. Someone has read this number.
Read 3900.
What's the next number of 3900,
Health; 4000。
Division; why
Health; The next number of 3900 is to add 1 to the hundreds of 3900.
Division; Well, what did you find,
Health; I found that hundreds of people are over ten years old. We should take ten out of a hundred and put one into a thousand.
(3) Learn to write 4000,
Division; How to write this number,
Health; Write from the high place first, it is thousands, thousands on four, thousands on four.
Division; What are those hundreds and dozens of people writing?
Health; There is no one in their position, and they are all 0 in the hundreds and tens.
(4) Learn to read 4000
Health; Read from the high place, four thousandths, read as four thousand, read or not read the zero at the end of that number, right, don't read the zero at the end of that number.
What's the next number of 3.4000? 4 100 is written as 4 100 and read as 4 100.
Summarize; Just now we learned to dial the big numbers in life and read the big numbers in life. Write the big numbers in life,
Fourth, the game link
It's amazing. Now let's play a game together. The teacher dialed the number to see who wrote quickly and accurately. After that, the teacher wrote the answers on the blackboard. Please applaud the students who answered correctly. The teacher dialed 5006. Students write 5006. By the way, students applaud themselves. 806, ditto, 4800, ditto.
Fifth, consolidate practice.
Write question 4 on page 32 of this book.
Summarize; After learning the reading and writing methods of large numbers in life, what should I pay attention to when reading and writing numbers?
1, when studying,
2. Reading from a high position,
Thousands of people study thousands, and hundreds study hundreds. Read each number several times and add the benchmark counting unit. There is a bell in the middle of the number or several consecutive numbers are all read as 0.
3. Don't read the last zero.
4. Write down the number.
(1) Write a few words on each number.
(2) There is no number in any digit, and that digit is only 0.
Blackboard design;
① Read the numbers on each number and keep up with the counting unit.
(2) There are one or several zeros in the middle, all of which are read-only.
No matter how many zeros there are at the end, don't read them.
Everyone writes as much as they can.
(5) If there is nothing, just write a zero on that one.
Chapter III Teaching Contents:
Dialing (page 24 of this book)
Teaching purpose:
1, stimulate the interest in reading and writing numbers in the activity.
2. Have a concrete sense of large numbers in mathematical activities and develop a sense of numbers.
3. Know the number sequence within 10000 by dialing beads on the counter, and be able to read and write numbers within 10000.
Teaching focus:
Understand the order of numbers within 10 thousand, and be able to read and write numbers within 10 thousand.
Teaching difficulties:
A sequence of numbers within ten thousand.
Teaching preparation:
counter
Teaching process:
First, review.
1. Show a list of numbers: Do you know how they are arranged?
From the right, the first digit is one, the second digit is ten, the third digit is hundred, the fourth digit is thousand, and the fifth digit is ten thousand.
2, the relationship between the counting units
10 one is ten, 10 ten is one hundred, 10 one hundred is one thousand, 10 one thousand is ten thousand.
Second, the new lesson
Introduction: Today we continue to dial and count the large numbers in our lives.
Teaching dial
Question (1), the teacher wrote "2932" on the blackboard.
The teacher asked the students to work out this arithmetic problem on their calculators. Please raise your hand if you have dialed.
After the students raise their hands, let them say how they dialed and why. Then ask the students how to pronounce this number.
Let the students count to 32 one by one. Count from 100 to 900, and then count from 1000 to 2000.
(4) Say how many thousands, hundreds and ones there are in 2392.
⑤ Let the students count and dial together in groups of four. Student activities and teacher inspection.
[6] The teacher asked the students to open page 24 of the book and dial the number themselves. (9,040) (1,00 1) After the self-study, the teacher asked the students to be small teachers in front of the teaching desk and guide everyone to dial.
Two. Teaching reading and writing number
The students tried to read the numbers set aside. Then these numbers are classified.
1, category I: numbers without 0.
(1) Students read the reading again and then show the numbers on the counter.
(2) Take the student representatives to talk about how to read numbers. How to read them? Why do you study like this?
(3) Everyone writes a number without 0. Please read at the same table. Then draw some tables to report.
2. Category II: Numbers with 0 in the middle.
(1) The teacher shows these two numbers on the counter in turn. Let the students read them first, and then talk about the composition of this number. What did you find?
(2) Summary: the method of reading numbers with 0 in the middle; No matter how many zeros are in the middle, only one zero is read.
(3) Show the numbers with only 0 in the middle for students in other groups to read.
3. Category III: Only numbers ending in 0.
(1) Send a representative to talk about the pronunciation of such numbers, and the teacher will summarize it.
(2) Show the numbers you wrote to other students.
4. Category 4: Numbers with zeros in the middle and at the end.
(1) Read and talk about the method, and the teacher summarizes it.
(2) Show the numbers written by the delegates to see who can read fast. Read it after the students have finished reading it themselves.
(3) You call and write to me.
Look at the numbers in the book and try to write them down.
(2) What should I pay attention to when writing numbers?
(1) Write as much as you want.
(2) where there is no place, use zero to make up.
(4) Summarize reading and writing methods.
Third, strengthen training.
1. The abacus is briefly introduced on page 24 of the book.
2. Question 3 on page 26 of the book
(1) Guide the students to look at the pictures and let them find that there are 100 sweets in a bag and 10 sweets in a bag.
(2) Students complete independently as required.
Tell me how you worked it out.
Four. abstract
What did we learn in this class?
Fifth, classroom testing.
975、()、995、 1005、()、 1025
997、()、()、 1000、 100 1、()
3800、()、4000、4 100、()、()
Blackboard design:
Reading time
(1) Read the number on each number and keep up with the counting unit.
(2) There are one or two or three zeros in the middle, and only one zero is read.
(3) No matter how many zeros there are at the end, don't read them.
When writing numbers
(1) Write as much as you want.
(2) Where there is no place, use zero to make up for it.