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How many tens are added to the second volume of mathematics in the first grade of primary school 1? 29 plus 1 is three tens.
29+ 1=30=3x 10
Thank you. Please accept it.
What is the concept of the second volume of mathematics in the first grade of primary school?
This teacher is really confused, let him recite without saying goodbye!
It is suggested to find some bold characters or the back of the scarlet letter to fool. This kind of homework is very irresponsible!
How many bottles of milk are there in the first volume of mathematics in the first grade of primary school? Dear teachers present:
Hello everyone!
I am very happy to discuss and study with all the teachers. The teaching and research theme of our course is to understand the diversity of algorithms and guide the optimization of algorithms.
The teaching content of this lesson is how many bottles of milk are there in the first volume of primary school mathematics in Beijing Normal University, pages 72 and 73.
After discussion by several of our teachers, the teaching background of this course is deeply analyzed. The situational activity "How many bottles of milk are there" is the first time that students come into contact with the carry addition of numbers within 20, and it is also an important stage to establish the concept of bit value. The content presented in the textbook is divided into three parts: (1) Put forward a mathematical problem according to the life situation for students to think about. ⑵ Provide students with some thinking methods to solve this problem. (3) Directly calculate the formula of carry addition as consolidation exercise. Learning this part of knowledge well will have a great influence on students' follow-up study.
In daily life, students have accumulated some experience about numbers under 20 and their operations. They like to learn math from the examples around them. Through the previous math study, most students have a preliminary understanding of the decimal system. But students' cognitive ability is different. In the teaching process, teachers will arrange activities such as posing and counting as much as possible to help students master arithmetic and optimize algorithms.
According to our understanding of teaching materials and students' cognitive level, the teaching objectives of this course are established as follows:
1. Through the exploration of the problem situation, students came up with their own method of calculating the carry addition of 9 plus several, initially perceived the diversity of calculation methods, and understood the simplicity of the "rounding to ten" method.
2. Develop students' mathematical thinking in the process of exploring methods, improve their ability to solve problems, and cultivate students' awareness of exploration and good study habits.
3. Make students realize the close connection between mathematics and real life, enhance their positive feelings about mathematics, and experience the happiness of cooperation and communication with their peers.
According to the actual situation of students and the characteristics of teaching materials, we will establish the teaching focus of this course as follows: correctly calculating the carry addition of 9 plus several by using the "plus ten method", and establish the teaching difficulty of this course as: infiltrating and transforming ideas, realizing the diversity of calculation methods and optimizing algorithms.
In order to better achieve the teaching objectives of this class, in line with the concept of "let students learn mathematics in vivid and concrete situations", teachers will adopt the teaching method of "guide-explore-develop" to organize teaching activities. "Hands-on practice, independent inquiry and cooperative communication" is an important way for students to learn mathematics in this course. In the teaching process, dynamic and diversified evaluation methods are adopted, and multimedia courseware and various learning tools are paid attention to to to help students transform from thinking in images to abstract thinking, highlight key points and break through difficulties.
Based on the above understanding, we design the teaching process of this class as the following four links.
The first link: create a situation and ask questions.
"Mathematics Curriculum Standards" advocates: "Let students learn mathematics in vivid and concrete situations". At the beginning of the class, teachers use students' life experience to create a learning situation of "introducing nutritious food to Tao Tao" which is closely related to students' living environment and knowledge background. Courseware shows the situation map in the textbook in time, so that students can ask questions according to the number of two boxes of milk, thus skillfully leading to the math problem of 9 plus several. This not only stimulates students' interest and initiative in learning, but also makes students realize that mathematics comes from life and cultivates students' ability to find and solve problems.
The second link: explore the algorithm and solve the problem.
In this link, the first step is to guide the formulation. Let the students talk about the information in the picture and the problems to be solved, and then let the students list the formulas independently. When reporting by name, teachers should guide and evaluate in time.
The second step is to explore the algorithm. "Mathematics Curriculum Standard" clearly points out: "Effective mathematics learning activities can't rely solely on imitation and memory, and hands-on practice, independent exploration and cooperative communication are important ways for students to learn mathematics." In the process of exploring the algorithm, ask students to represent two boxes of milk with sticks or disks of different colors, then put them on the table and talk about them, or choose their favorite methods to solve the problem and tell their deskmates their own methods. In the process of students' activities, teachers pay attention to patrol to understand students' activities. Then, students freely report the algorithm and the whole class communicates the algorithm. Here, let students experience the formation process of knowledge first, and on the basis of independent exploration, through exchanges and comparisons with peers, constantly optimize and improve their own algorithms. In this process, the teacher focuses on guiding students to understand the "ten-complement method", so that students can find that several algorithms do not exist in isolation, they are related, thus highlighting the focus of teaching. The diversity of this algorithm fully pays attention to the individual differences of students, allowing them to compete in cooperation and develop in communication.
Do you know why no one answered page 45 of the second volume of mathematics in the first grade of primary school? Because the person who answered the question didn't have the book "Excellent Learning and Practice of Mathematics in the First Grade of Primary School", he didn't know what the topic on page 45 was, and he couldn't answer it. Post questions or photos in the future to help you quickly.
Is there any hand-made mathematics in the first grade of primary school?
Isn't this from the art class of preschool education?
Do you need all the answers to the exercises in the second volume of mathematics in the first grade of primary school?
One. See who can calculate quickly and accurately.
97-53+2 1= 100-23+ 15= 25+43+ 12= 55- 16+ 19= 66-59+3 1=
28+37-5 1= 65+26-55= 54+45-66= 89- 18+20= 9+32+45=
83-25-36= 12+59+32= 74-9-28= 66-79+22= 85+ 15-6 1=
70-40+30= 80+20-60= 90-70+60= 30+50-60= 70+2 1-54=
66+26-55= 75+2 1-87= 100-94+80= 45+34+9= 98-89+90=
Two. 100 subtract 9 continuously, and write down the difference of each subtraction.
100 ____ ____ ____ ____ ____ ____ ____ ____ ____
Three. Fill in the blanks according to the questions.
1, Xiaoming picked 30 flowers, Xiaohua said that she picked 4 more than when she was a child, and Xiaohua said that she picked more than Xiaoming and less than Xiaohua.
Xiaohua picked () flowers, Xiaohua picked at most () flowers, at least () flowers, and maybe () flowers.
Xiaohua comes home from school at 5: 35. When is it in half an hour? ( )
Xiaoming arrives at school at seven o'clock and goes home from school at 12 o'clock. How long did he stay at school? ( )
It's half past three. When is another hour? ( )
5. One digit is 9, one digit is 0, and this number is ()
6, 78 is composed of () a one and () a ten and a number, and the first three numbers are ().
(), (), and the two numbers adjacent to it are () and ().
7. The minuend is 89, the difference is 6 1, and the minuend is ().
8. The total is 63, one addend is 9, and the other addend is ().
9. The subtraction is 5 1, the difference is 24, and the minuend is ().
10,51to 100, with maximum two digits () and minimum two digits ().
Four. Look at the problem formula.
0.5 yuan needs an ice basket, 30 yuan needs a toy car, 98 yuan needs a bike and a dress? Yuan, a pair of pants 30 yuan.
1. If you want to buy a toy car, you have to pay RMB 10, at least () yuan, and you have to get back () yuan.
2. I bought an ice bath and a pair of pants and paid 3 1 yuan. How much should I get back?
It took 92 yuan to buy a dress, a toy car and a pair of pants. How much is a dress?
Xiaoxing wants to spend the least money on two things. How can she buy it?
5. Find out the rules of filling in the blanks.
1、25 ____ 3 1 ____ 37 ____ ____ ____ ____ _____ ______
2、 10 ____ 30 ____ _____ _____ _____
3、95 90 80 75 _____ ______ _______ ______ ______
4、2 5 7 12 ____ ______ _______
5、2 4 8 16 _____ _____
Sixth, do as required.
1. What two numbers can be represented on the counter with six beads? Draw a picture before you write.
Hundreds, hundreds.
Writing: _ _ _ _ _ _ _ _ _ _ Writing: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Read: _ _ _ _ _ _ _ _ _ Read: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Hundreds, hundreds.
Writing: _ _ _ _ _ _ _ _ _ _ Writing: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Read: _ _ _ _ _ _ _ _ _ Read: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Seven, drawing according to law.
1、
2、
3、
4、
5、
6、
7、
8、
One. See the formula of the problem.
1 The children in Class 62 planted 3 1 trees, Class 63 planted 35 trees, and Class 64 planted the same trees as Class 63. How many trees have they planted?
(1) How many more trees have been planted in Class 64 than in Class 62?
(2) How many trees were planted in Class 64 and Class 62?
2. Xiaohua drew 46 balloons, Xiaohong drew 6 more balloons than Xiaohua, and Xiaoming drew 10 fewer balloons than Xiaohong.
(1) How many balloons did Xiaohong draw?
(2) How many balloons did Xiao Ming draw?
(3) How many balloons did they draw?
(4) How many balloons did Xiaohua draw than Xiaoming?
3. There are 36 butterflies and 4/kloc-0 bees. How many butterflies are less than bees?
Two. Fill in the blanks.
1, one-to-one correspondence, the second number after 56 is (), and the first number before 56 is ().
2. One digit is 6 and one digit is 8. The number is pronounced () and written ().
4. Write a number less than 5 1 greater than 40 ().
Of the numbers 5, 58, 43, 96, 88 and 75, the largest is (), and the smallest is (), which is 50.
Big, the number less than 88 is (), the number greater than 40 is (), and the number less than 96 is ().
6, 6.9 yuan = () Angle, 7.5 Angle = () points, 84 points = () Angle.
7. The numbers are one after another. The three numbers after 96 are () ().
8. The two numbers adjacent to 89 are () ().
9. Write a number greater than 62 and less than 7 1 ().
10, one hour = () minutes, one minute = () seconds, and those two hours = () minutes.
Three. Complete the following formula.
- 1
( )+( )=( ) ( )+( )=( )
( )+( )=( ) ( )+( )=( )
-2
( )-( )=( ) ( )-( )=( )
( )-( )=( ) ( )-( )=( )
Fourth, find a pattern.
1. Guess the figure or number covered by the cloud and fill it in ().
( 1)、 ( )
(2)、 6677788886 8888667778888 ( )
2. Give the following figure a regular color on the picture.
Five. Calculate the formula/fill in the blanks according to the questions.
1, Xiaoming has 43 paper boats, with 23 fewer florets and 3 more florets in Xiaotian.
(1) How many paper boats does Xiaohua have?
How many paper boats are there in Xiaotian?
(3) How many paper boats does Xiao Ming have than Xiao Hua?
(4) How many paper boats does Xiao Ming have than Xiaotian?
(5) What other questions can you ask? And list the formulas.
Xiaohua has 59 balloons and Xiao Li has 63 balloons. Xiaomei has more balloons than Xiaohua, but fewer than Xiaoli. Little sister may be the most.
(), at least it may be () or ().
Teacher Zhang has 53 shuttlecocks, 39 of which were borrowed by classmates and later returned to 15. How many badminton does teacher Zhang have now?
There are 52 watermelons in the car, and 3 1 was moved in. Then I sold 47 watermelons. How many watermelons are left now? How much more is sold than moved in?
The picture can't be displayed, please call me.
Math Volume 36+()=()-4 in the first grade of primary school If the two spaces are required to be the same, then this question has no solution.
If these two spaces can be different, then there are infinite solutions to this problem.