Collect ten songs
19 19 years of good friends,
Hand in hand,
3737 is so close.
Let's go together, four, four, six, six.
Make a pair of hands in half.
One plus nine, ten tadpoles
Two plus eight, ten old ducks,
Three plus seven, ten old hens,
Four plus six, ten golden monkeys
Five plus five, ten big tigers.
See 9 and think of 1,
See 8, think of 2,
Seeing 7 and thinking of 3,
See 6, think of 4.
See Osuka decimal.
First, change the position of two numbers and calculate the ballad mathematically (make up ten songs).
Carry addition within 20
Children should remember "9 to 1", "8 to 2", "7 to 3", "6 to 4" and "5 to 5"
The method of filling ten is simple and easy, and the thinking process includes "one look (looking at large numbers), dichotomy (dividing decimals), three tenths and four additions."
Carry addition within 20
Look at large numbers, divide them into decimals, make up ten, and add up the remainder.
Abdication subtraction
The abdication subtraction should be kept in mind, starting from the unit;
Who is not enough to retire, don't forget to add ten to the standard;
It's best to remember that the interval is 10 and becomes ten.
Successive abdication subtraction
When you see 0, go and see which one has it.
Borrowed and walked back, 0 is a bit like 9.
For example, 1: when you add 8+5, you think of 2, so 5 can be divided into 2 and 3, and 8 and 2 can be composed of 10,/kloc-0+3 =13, so 8+5= 13.
For example, 2: minus 15-9. The first one: 15 can be divided into 10 and 5, 10-9 = 1 = 6, so15-9 = 6; The second type: 9 can be divided into 5 and 4 15-5= 10, 10-4=6, so 15-9=6.
Teach within ten laws. Part 2 Activity Objectives
-Use the add+ method to learn carry addition within 20.
Second, let the children operate by themselves and learn how to make up ten points in the process.
Third, cultivate children's interest in learning mathematics.
Activity process
Review the composition and decomposition of ten and learn the composition of ten rhymes.
19 19 good friends, 2828 holding hands, 3737 really close, 4646 walking together, 50/50 making a pair of hands.
Review ten plus a few.
The sum of ten plus a few equals ten.
Third, learn the ten-point method initially.
There are many ways to calculate addition in life. In order to make the calculation easier, we change it to ten plus several, so we must find out ten first.
Put 8 on the digital map first, and divide 7 into 2 and 5, 8+2= 10, 10+5= 15, so 8+7= 15.
Repeat the exercise.
Five summarized ten methods.
The ten-point method is to make addition easier and turn addition into a familiar method for children. So, first of all, find out ten and work out the method of ten. Using the ten-point method, children are required to master the division within ten, so they must practice more after class and have a solid foundation.
Addition Teaching within Ten Methods and Ten Complements —— Chapter III
Teaching objectives:
Knowledge and skills: enable students to understand and master the calculation method of 9 plus several, and correctly calculate 9 plus several.
Process and method: Combining with the problem situation, through operation, let students experience the process of adding several and nine, and initially perceive the method of "adding ten"
Emotional attitude and values: in the personalized communication of algorithms, experience the diversity of algorithms, so that students can experience the joy of success in the learning process.
Teaching emphasis: make students understand and master the calculation method of 9 plus several, and can correctly calculate 9 plus several.
Teaching difficulties: make students understand and master the calculation method of 9 plus several, and can correctly calculate 9 plus several.
Teaching preparation: teaching wall charts or courseware, sticks
Learning methods: hands-on operation and group cooperative learning.
Teaching process:
First, review 9876.
^^^
□ Word of mouth
5432
^^^^
□□□□□□□□ Word of mouth
Second, new funding.
(1) Show the scene map (see the textbook) and look at the picture. 9+3= mouth, then put it with a stick and try to calculate it yourself.
(2) How to calculate the communication with each other, and pay attention to students' mastery of the method of rounding off to ten. Teachers and students communicate and talk about their own understanding of "filling ten", and the teacher summarizes. For example: 9+3= 12
Divide 3 into 1 and 2, and divide 1 and 9 into ten grades.
Third, practice.
(a) put a pendulum, calculate.
9+6==9+7= mouth
9+8==9+9=□
Students can calculate while posing, and they can use the method of "rounding up ten".
(2) Show a wall chart (see the textbook) to guide students to understand the meaning of the picture. Students can do it independently, then communicate with teachers and students and tell them what you found.
(3) Look at the picture (see the textbook).
□+□=□□+□=□
(4) In order to pick peaches, the little monkey climbed to the top of the ladder, and now he has to answer the formula correctly before he can get down. The little monkey is worried. Can you help him? (Show wall charts or courseware)
After the teacher guides you to understand the meaning of the question, let the students finish it independently and then communicate.
Fourth, the independent small world.
Students write their own questions and calculate them themselves.
Five, the class summary:
Students, what did you learn today?
Teaching reflection:
1, respect students' ideas, encourage independent thinking, provide diversified algorithms, fully respect students' own methods, and cultivate them through mutual communication between students.
Students' sense of cooperation.
2. Not fully taking care of all the students, especially the underachievers.
3, the design of teaching links has not been well thought out, and some knowledge is not clear enough to explain.
Add/kloc-teaching in 0/0 methods-Chapter 4
The specific steps are as follows:
Preparation materials: math books and pens.
The addition within 1 and 20 is easier to calculate than the subtraction within 20. Take 7 plus 8 as an example here.
How to teach children to subtract less than 20 steps with ten kinds of addition
2. Look at the front 7 plus 8.7, decompose 8, and think that 7 and several additions form 10, which is 3, so divide 8 into 3 and 5. Remember, 3 should be written in front, so that 7 can be added up later.
How to teach children subtraction steps in 20 minutes
3. Write the answer of the addition of 10 addend 7 and the following addend 8, and make a calculation of 10. No matter what the addend is, it will be
Appendix Decomposition and Addendum Sum 10,
How to teach children to do subtraction within 20 steps by addition
4. Then add 10 with another number decomposed by addend, and you can get the result of this problem. Addendum decomposition is the score of numbers within 10.
Yes, simple and error-prone.
How to combine a method to teach children subtraction steps in 20 minutes?
5. Practice again with 9 plus 3. Divide the addend 3 into 1 and the preceding 9 into 10, and then decompose 3 into 1 and 2, so that 10 plus 2 is 12, and you can get the answer to the question.
How to teach children to do subtraction within 20 steps by addition