Teaching plan for large class mathematics activities: symmetry

As an excellent faculty member, it is often necessary to compile teaching plans, which can make teaching more scientific. How to write the lesson plan? The following is the teaching plan of large class mathematics activities that I arranged for you: symmetry, welcome to read the collection.

Teaching plan for mathematics activities in large classes: symmetrical articles 1 activity objectives

1, learn the mathematical knowledge of "symmetry" in order to understand the meaning of "symmetry".

2. Improve children's hands-on ability in the operating experience and learn to cut simple symmetrical figures.

3. Cultivate children's ability to observe, judge and operate.

4. Stimulate children's interest in learning graphics.

5. Stimulate children's interest in learning.

Activity difficulty

Chivalry understands the meaning of "symmetry", uses its own knowledge points in the process of operating experience, and puts learning and even application in children's teaching classes.

Focus of activities

Understand "symmetry" in a broad sense, improve children's hands-on ability and experience the fun of learning.

Activity flow

A "play" symmetry, experience characteristics

1. No one will leave a blank sheet of paper, fold the paper in half, and then tear it from the crease to tear out the figure they like.

2. Show some children's works and look at these figures. Have you found anything in common?

Guide children to observe, compare and summarize the characteristics of these figures: the left and right sides are the same when folded in half, and they will overlap when stacked together.

The teacher put forward this concept: after being folded in half, the left and right graphics can be completely overlapped, which we call symmetrical graphics.

Second, the scissors are symmetrical and experienced in operation.

1. Say it.

Definition: What is symmetry? (refers to two pairs of figures or objects with one-to-one correspondence in size, shape and arrangement)

take a look

A. Show half of a symmetrical figure, and let the children imagine what it would look like if they were combined with the other half.

B. The teacher cut out two pictures in a symmetrical way (demonstration)

Cut it off.

C. the children cut out the symmetrical figures drawn by the teacher themselves.

D. Children imagine themselves cutting symmetrical figures.

Third, "find" symmetry and raise awareness.

Find out what is symmetrical in life.

Teaching plan for large class mathematics activities: symmetry Chapter II Activity name:

Kingdom of symmetry

Active language:

Teacher: Look, children, where is this?

Youth: castles and kingdoms

Teacher: Yes, this is the kingdom of symmetry. Only symmetrical pictures are allowed in a symmetrical kingdom, and asymmetrical pictures can only be left at the door.

Teacher: Who can say, what is symmetry?

Young 1: Symmetry means that both sides are the same.

Teacher: Oh, both sides are the same. Are they exactly the same?

Teacher: Who can tell us how the two sides are the same?

Yang: That's the first box on the left and the third box on the right.

Teacher: Oh, I see what he means. He is talking about the symmetrical butterfly activity we did last time. There is a symmetry axis in the middle, and the red pin is in the first square on the left. Where is it on the right?

Yang: the first case

Teacher: Is it the first one?

Yes

The teacher took out a symmetrical butterfly board for the children to observe.

Teacher: Who can tell me where the green nail on the left is?

Young 2: On the left, just skip two white squares.

Teacher: Can you come and show us?

The child points out the nail insertion position and inserts the nail.

Teacher: Is he looking for a suitable position?

Young: The position on the left of the green nail is also two squares away from the central axis, which is called a symmetrical position.

Teacher: Then how was the symmetrical doll we saw last time symmetrical?

Yang: It is the superposition of the two. If they are not stacked together, they are not symmetrical.

Teacher: How to stack them together?

Yang: From the middle. ...

Teacher: If you fold in half from the middle, what can completely overlap is a symmetrical figure, and what can't completely overlap is not a symmetrical figure.

Show me the photos.

Teacher: What's this?

Yang: the key

Teacher: Look carefully, children. Which of the two keys is a symmetrical figure?

Young 3: The pink one is symmetrical, and the orange one is asymmetrical.

Teacher: Pink is symmetrical. Can you tell me why?

Because its two handles are exactly the same.

Teacher: Then please tell me where is the symmetrical position here?

The child stepped forward and pointed out

Teacher: Really?

Yes

Teacher: Do you all agree with him?

Yes

Teacher: So this key is symmetrical, right?

Yang: No.

Teacher: Why?

Young 4: Because there are two forks here and one fork here.

Teacher: Oh, there is no symmetry here, is there?

Yes

Teacher: So it is not a symmetrical figure.

Teacher: Let's try it, and fold it in half from the central axis.

Young man: Laugh.

Teacher: Are they completely coincident?

Yang: No.

Teacher: Can this key enter the kingdom of symmetry?

Yang: No.

Teacher: Let's look at this again.

Teacher: Oh, dear! How's it going?

Young 5: Completely coincident.

Teacher: Yes, she completely overlaps. Can it enter the kingdom of symmetry?

Yang: Yes.

Teacher: Today, besides these two keys, there are some graphic babies who want to play in the symmetrical kingdom. Let's see who they are.

Yang: rectangle, square, triangle, trapezoid, circle,

Teacher: I want to ask a child to find a symmetrical figure to play games in a symmetrical kingdom.

Find this rectangle

Teacher: How do you know she is symmetrical?

Fold in half and find that it can completely overlap.

The teacher asked the children to send them to the kingdom of symmetry.

Teacher: At present, there are many graphics at the entrance of the kingdom I want to play. Today, Miss Li has prepared an activity for each child. The name of the activity is "Kingdom of Symmetry". What do you do first when you get back to your seat?

Swim 6: First put the portrait in a small bowl.

Teacher: The numbers are in the small bowl now.

You7: Put the characters at the gate of the kingdom first.

Teacher: Then what?

Then send the symmetrical graphics into the kingdom of symmetry.

Teacher: What method is used to check whether this figure is symmetrical?

Yang: Give me a discount.

Teacher: Where can I fold it?

Yang: the central axis

Teacher: Besides this activity, Miss Li has also prepared two activities: symmetrical butterflies and the order of numbers. Children can choose their favorite activities to operate! Conclusion: Children in large classes have relatively complete language expression ability and a certain degree of language understanding ability. The teacher's questions can be understood and answered by children, but the teacher's language must be accurate and precise to avoid causing unnecessary misunderstandings for children. The child's thoughts are very direct, and what the teacher says is what the child thinks, so the language requirements for the teacher are higher. Only when the teacher's language is accurate can the child have a more accurate and concise language!

Teaching plan for large class mathematics activities: symmetry Chapter III Activity objectives:

1. Feel the symmetry of the graph.

2. Understanding the meaning of symmetry can correctly judge whether the graph is symmetrical.

3. Experience the fun of folding in half.

4. Stimulate children's interest in learning graphics.

5. Guide children to actively interact with materials and experience the fun of mathematics activities.

Activity preparation:

Symmetric tree, symmetrical house 1, symmetrical triangle picture 1, asymmetrical house, asymmetrical triangle, asymmetrical teapot; Find a symmetrical piece of homework paper for everyone.

Activity flow:

First, the story is imported.

There lived a beautiful princess in a kingdom. One day, a wicked witch came to the kingdom. She locked up the princess and set up five difficulties. People tried to get out of the princess, but they failed to get through these levels. Children, are you willing to overcome difficulties?

Secondly, introduce the concept of symmetry.

Teacher: "children, before you break through the customs, the teacher has some secrets about this kingdom." Let the teacher help you. " (Let children observe symmetrical figures, explore and find the same places, and get to know symmetrical figures.)

Third, deepen the understanding of symmetry through games.

1. The first level, unlock, find a symmetrical figure.

2. The second level, look at butterflies and find symmetrical patterns.

3. At the third level, look at Facebook and find symmetrical graphics.

4. The fourth level, classification, find out which are symmetrical figures and which are not.

5. The fifth level, let the children draw a symmetrical grid figure.

Fourth, connect with reality.

Let the children find the symmetrical graphics on the teacher in their lives and share their understanding of symmetrical graphics.

Five, hands-on operation

Prepare an operation card with half graphics for each child (the graphics are different), and let the children find out the symmetrical patterns corresponding to the graphics and colors in a pile of pictures and stick them on the operation paper.

Activity reflection:

Mathematics activities in large classes: "Interesting symmetry" is an activity in the second class. Children have already perceived the symmetry of "Peking Opera Mask" in the last class. Therefore, on this basis, let children learn the concepts of symmetry and symmetry axis, and they will judge symmetrical figures and develop their observation and judgment.

At the beginning of the activity, I still used the "Peking Opera Mask" to import, so that children could observe it carefully and find out the mystery. The children said, "There are colors and patterns on the face, and they are exactly the same." Then the teacher grabbed the same answer and told the children that the secret of the face is that the pattern, shape, color and size on the left and right sides are the same, but they are piled up in opposite directions.

The second part provides a variety of symmetrical and asymmetrical graphics for children to continue to perceive and understand. The first part is to see if these figures are symmetrical. (The teacher provides symmetrical figures) Then let the children talk about how they perceive his symmetry, look through their eyes, fold it by hand, and then share with you the method of folding a single child in half. * * * Try this method to verify whether the graph they just got is symmetrical. The second part is based on the cognition that symmetrical patterns have the same size, shape and color and can be folded in half. This crease is the symmetry axis. Continue to operate and feel that these patterns are symmetrical? And classify them and send them to the designated basket. In this link, many children make mistakes and are easily confused. In order to make children better understand and perceive, after the children operate, through the above observation and folding, they will carry out collective verification, analyze and judge the patterns one by one, and let the children know that squares, houses and leaves are symmetrical, and scissors and butterflies are symmetrical.

The third part, let children use the operation of "Symmetry Kingdom" page in children's courseware. In the activity, I set up a story situation that children are interested in-saving the imprisoned "Little Princess of Symmetry Kingdom". With the demonstration of multimedia courseware, children's interest is strongly stimulated. With the help of the children's eagerness to save the little princess, symmetrical teaching activities were carried out from easy to difficult. In the process of breaking through the customs, we set up links such as comparison, guessing, trying, drawing, speaking and doing, so that children's multiple senses can participate in teaching activities. In a relaxed learning atmosphere, children are always excited, happy and eager to think. They experienced the whole process of "doing mathematics" and "playing mathematics", felt the joy of learning mathematics and tasted the joy of success.

1. One to one.

Although symmetry can be seen everywhere in life, children are not clear about the concept of symmetry. So at the beginning of the activity, I directly used symmetrical paper-cutting to help children understand the scientific concept of symmetry, so that children can clearly see through comparison that only completely coincident figures are symmetrical figures. This laid a good foundation for children's exploration and operation activities.

2. Guess.

This link is to help butterflies find symmetrical wings. "Guess" is not an end, but an active "search". Through children's guessing and dynamic demonstration of courseware. After happily "guessing", the children went to find the similarities and differences between left and right. In the process of guessing, children's interest is very high. They actively look for the similarities and differences of each wing, and finally naturally find the condition of "symmetry": the shape, color, size and pattern are the same, but the direction is opposite. This is also the focus of this activity.

3. Give it a try.

In the process of guiding children to explore the axis of symmetry freely, I focus on guiding children to observe whether and how graphics can overlap. Is there any other way to overlap? Let children have an inner thinking process, let children explore independently, let children feel and experience in activities, help children acquire knowledge in exploration and cultivate innovative thinking ability.

4. Draw a picture.

Drawing different symmetry axes on the same object should be the most difficult part of this activity. I don't think this is the basic goal of this activity, but children can try. First, children in large classes love a little difficult challenge. Secondly, according to the spirit of the new syllabus "Support and encourage children to actively use their hands and brains to find answers or solve problems", we need and can provide enough exploration opportunities in activities to satisfy children's exploration desire. As expected, the children's exploration results surprised me: most children drew two symmetrical axes of rectangle, four symmetrical axes of square, and many children drew many symmetrical axes of circle. ...

5. Do it.

The first two links are mainly about speaking, while in the "doing" link, the children cooperate in pairs to compete which group does the action more symmetrically. This can not only relax the child's active body for a while, but also stimulate the child's original consciousness and cooperative spirit and consolidate the understanding of "symmetry". This is a link that children like very much. Although it was a touching moment, the children were very happy because of their tacit cooperation.

Reflecting on this activity also has many shortcomings:

1. Courseware making technology itself is insufficient, and it often needs the help of young teachers, and more efforts are needed in this respect.

2. The preparation process can be more adequate. For example, you can prepare more homework papers, so that children can find symmetrical patterns on the homework papers first, then draw symmetrical patterns, and finally draw the other half of the symmetrical patterns.

Although this lesson has passed, there are still many symmetrical patterns in our real life, and life contains many connections related to mathematics. We need to take our children to discover, find and sort out their existing experience, and then use our hands and brains to master systematic knowledge.

Teaching plan for large class mathematics activities: symmetry Chapter IV Activity name: symmetry

Activity objectives:

1, understand the concept of symmetry, and know two forms of symmetry and axial symmetry.

2 initially perceive symmetrical things and symmetrical beauty in life, and cultivate children's observation and aesthetic consciousness.

Activity preparation:

1. Children's operation materials: butterfly wings, bee wings and dragonfly wings with different sizes, colors and patterns. Peking Opera masks, window grilles, leaves, clothes and scarves are displayed in the classroom environment.

2, paper, scissors.

3. The background picture of spring.

Activity flow:

First, perceptual symmetry.

1. Synopsis: Spring has come and the garden is full of colorful flowers. Beautiful butterflies, bees and dragonflies are dancing happily among the flowers. At this time, a dark cloud came, and the game was bigger than that. Friends quickly flapped their wings and prepared to fly home. Suddenly, everyone shouted, "I lost a wing and can't fly!" " "(The wings of paper butterflies, bees and dragonflies are scattered in the background picture) The rain is getting heavier and heavier. Who wants to help them find another wing?

2. Grouping operation: find wings for butterflies, bees and dragonflies. Please match the wings of butterflies, bees and dragonflies in the background picture.

3. Children show the paired wings and explain the reasons for the pairing (from the perspective of color, shape and pattern).

4. Teacher's summary: The wings of butterflies, bees and dragonflies take the body as the center line, and the left and right sides are exactly the same in size, color, shape and pattern, but in opposite directions. We call this form axisymmetric.

Second, find symmetry.

1. Children observe leaves and petals, doors, windows, toy cabinets, clothes and other items in groups, and enter the art area to observe works of art such as faces, window grilles and handicrafts to find out which items are symmetrical.

2. Teacher-student sharing: What do you think is symmetry? Why?

3. Teacher: Which organs of the human body are symmetrical? Can the movements be symmetrical? Please point out and perform. )

4. Teacher: What other symmetrical things have you seen in your life? Wings of airplanes, wheels of cars, veins of leaves, and so on. )

5. Teacher: Why are many things symmetrical? Smooth, beautiful and harmonious. )

Third, observation and comparison

1. The teacher let the children enjoy the round disk. What are the characteristics of the pattern on the plate? There is a dot in the middle and many patterns with the same size and color around it. )

2. Teacher: Is it the same as an axisymmetric figure? (Not the same. )

3. Teacher's summary: This is also a symmetrical pattern, with the dot as the center point, and the surrounding patterns are in size, shape and arrangement.

Identical columns are called point symmetry.

Activity expansion:

Make symmetrical

1. Let the children make their own symmetrical figures and see who makes the most symmetrical ones. The teacher suggested that children can use different methods such as folding and cutting. )

2. Show the children's works and let the children share their experiences with each other.

Teaching plan for mathematics activities in large classes: symmetry Chapter 5 Activity objectives:

1, to help children understand the concept of symmetry, and to guide children to use the math board for simple and symmetrical operations.

2. Improve children's observation ability and reasoning ability.

3. Cultivate children to develop good operating habits.

Activity preparation:

A set of children's math board, ppt, electronic whiteboard.

Activity flow:

First, use the whiteboard to help children consolidate their understanding of lines and columns.

1, review the meaning of rows and columns.

"On the mathematical chessboard, there are several rows of chess pieces placed horizontally and several rows of chess pieces placed vertically."

2. The teacher puts several rows or columns of chess pieces on the math board, so that the children can tell which row or column it is.

Second, use ppt to learn symmetrical teaching activities.

1. Look at the ppt demonstration to understand the symmetry axis.

"Today the teacher brought a straight line, which is a magical straight line. Let's have a look.

This is a triangle. A straight line divides the triangle in half from the middle. After folding in half, we found that the two halves are the same size and completely overlap.

This is a butterfly. A straight line divides the butterfly in half. When we folded it in half, we found that it was the same size and exactly the same. This straight line is really amazing!

Summary: from the middle of a figure or pattern, fold it in half along a straight line to become two figures or patterns with the same size. This straight line is called the axis of symmetry.

(3) A figure is folded in half along the symmetry axis, and the two folded parts are the same size. Such a graph is called an axisymmetric graph.

(4) A pattern is folded in half along the symmetry axis, and the two folded parts have the same size. This pattern is called an axisymmetric pattern.

Third, guide children to operate simply and symmetrically.

"This axis of symmetry is too powerful. Today, we will make an axis of symmetry in the patch panel. Please insert the black chess piece of lesson 10 in the fifth column. "

1. Insert 10 black pieces as the symmetry axis in the fifth column of the math board.

2. The teacher put two red chess pieces on the fourth row on the left side of the symmetry axis, and the children inserted two symmetrical chess pieces on their chessboard.

3. The teacher put four green pieces on the eighth row on the left side of the symmetry axis, and the children inserted four symmetrical pieces on their chessboard.

4. The teacher put a semi-triangle with red chess pieces on the left side of the symmetry axis, and the children put the same figure on their chessboard, and then put two symmetrical halves.

5. Similarly, put simple symmetrical figures with yellow chess pieces.

6. Children are free to draw a simple symmetrical figure on the math board.

"With this axis of symmetry, we can pose various symmetrical figures or patterns. Now please make a symmetrical figure or pattern with your favorite color. "

Fourth, the game consolidates the understanding of symmetry.

1, help Zihua find the other half of symmetry. (by color)

2. Help the monkey find the other half of his face. (Exclusion method, one by one)

3. Classify common objects in life according to symmetry and asymmetry.