"Division Graphics" large class 1 teaching plan teaching objectives;
1. Understand the meaning of dichotomy and learn dichotomy and quartering.
2. Explore the methods of bisection of various objects to stimulate children's interest in bisection.
3. Understand the relationship between the whole and the parts after equal division.
4. Let children learn simple math problems.
5. Stimulate children's interest in learning graphics.
Teaching preparation:
Bread, two hams of the same size, knives, various shapes of graphics.
Key points and difficulties:
Learn dichotomy and quartering.
Various methods guide children to explore the dichotomy of objects through operation.
Teaching process:
First, understand the meaning of equal division and learn equal division.
1, the teacher briefly tells the story of "two stupid bears".
Teacher: Mother Bear has two children, one is big black and the other is little black. They are fat, but they are all stupid. They are two stupid bears. One day, the weather was fine and the two brothers went out to play hand in hand. As they were walking, they suddenly saw a piece of dry bread by the roadside. They picked it up and smelled it. Hey, it's delicious. But there is only a piece of dry bread. How do two bears eat? Big black is afraid of little black eating more, and little black is afraid of big black eating more. It's not easy! Dahei said, "Let's share the food, but we should share it fairly. Mine can't be smaller than yours. " Black said, "Yes, to be fair, yours can't be bigger than mine." But how to divide it fairly? Let the children do something for them.
Yang: One person is half, and the middle is equally divided.
2. Show "bread" and individual children try to share "bread" equally.
Teacher: Please help brothers share bread in your way. Let the other children observe how he divides it.
Yang: He divided it from the middle.
Teacher: By the way, it's only fair to divide it in the middle.
3. The teacher cut the "bread" with a knife to verify.
Teacher: Are these two loaves of bread the same size?
Young: Same size.
4. Summarize the meaning of equivalence.
Teacher: dividing an article into equal parts is called equal division. Divide it into several parts and call it equal parts. Divide the bread into two parts like a bear and call it two equal parts.
5. Show different graphs to further understand the meaning of equal division.
Teacher: Now, please tell the children that these numbers are divided into several parts.
(Show hearts, sectors, squares, rectangles and circles. Divided into two equal parts, three equal parts, four equal parts, five equal parts and eight equal parts. )
Teacher: Why are these figures divided equally?
Yang: They are all the same size and shape. So this is an equally divided chart.
Teacher: How do you know how many parts it has?
Yang: Because it is divided into several parts with the same size and shape, it is divided into several equal parts.
Teacher: Please find out which figures are not equal. Displays squares, rectangles, sectors, triangles and circles. )
Teacher: Why aren't these figures equal?
Young: the size of the point is different, and the shape of the point is also different. So this is not an equally divided chart.
Second, children try to explore dichotomy and quartering.
(Children choose their own graphics and explore various methods of equal division. Please demonstrate the method of equal division. )
Yang: I divide it in half from the middle (edge to edge) and I divide it in half from the middle (corner to corner).
Yang: Fold it in half and then fold it in half, and draw two lines in the middle. Yang: My method is to fold in half and then fold in half (edge to edge). My method is to fold in half diagonally.
Third, understand the relationship between the whole and the part after equal division.
1, show two sausages for children to compare whether they are the same length.
2. Divide one of them into two halves, who is bigger and who is smaller than the original one? Then divide the equally divided part into two parts. What if we compare them?
3. Summary: The equal portion is smaller than the original. The more equal portions, the smaller each portion.
"Divide graphics equally" teaching plan for large classes Part II Activity objectives:
1. Let children perceive that many objects (graphics) can be divided into two equal parts through operating activities.
2, you should know that the whole is greater than the parts, and the equal parts are called half of the whole.
3. Cultivate children's interest in exploring knowledge and ability to solve problems.
Activity preparation:
1, operating materials: ribbons, oranges, straws, rice and other items, triangles, circles, squares, rectangles and other graphics.
2. Tools and materials needed: ruler, scissors, disposable transparent cups, disposable paper plates, jelly boxes, moon cake boxes, pencils and erasers; Balance, scale, etc.
3, a statistical table, find a friend music, graphics and other VCRs. Activity flow:
First, children's operation, the initial perception of the bisection of items.
1, import: the story VCR "Two Stupid Bears" Today, Teacher Zhang also prepared a lot of things for these two bears. Please use your brains to divide these things into two identical parts and give them to these two bears. You can use rulers, scissors, disposable transparent cups, moon cake boxes, scales, scales and so on to help you.
2, children's operation, teachers tour, encourage children to actively use their brains and find their own solutions to problems.
3. After children experience activities, the teacher verifies the right and wrong.
(1) Ribbon, the children show the results, and the teacher wants two equal copies. Q: How do you divide the ribbon into two equal copies? What tools were used? (Equal length)
(2) straws, children show the results, and the teacher wants two copies to be equal. Q: What method do you use to divide the straws into two equal copies? What tools were used? (Equal length)
(3) Rice. When the children show the results, the teacher must have two equal copies, and then ask: How do you divide the rice into two equal copies? What tools were used? If there is a lot of rice, how to save trouble? (Weigh in the same measuring cup) (equal parts by weight)
Four oranges, the child shows the results, and the teacher must be equal.' After two copies, ask: How do you divide the oranges into two equal parts? What tools were used? (Equal division)
Teacher: Dividing an object into two identical parts is called "dichotomy". The teacher plays the slide show of the child's own experience and expresses it in complete language.
Second, learn the bisection of graphics.
1, there are many things in life that can be divided into two halves. The teacher prepared geometry for you today. Now, please divide the geometry into two halves by folding.
2, children's operation, teachers tour, encourage children to actively start work, use their brains, and find ways to solve problems.
3. After the children experience the activity, the teacher records it on the statistical table.
① Display a circle. The teacher asked: how to divide it? What's the difference? Children speak, and the teacher demonstrates that a circle can be divided into two equal parts when folded from either side.
② Show the triangle. The teacher asked: how to divide it? What's the difference? (Children talk, teacher demonstrates, teacher: corners are folded diagonally)
③ Show a square. The teacher asked: how to divide it? What's the difference? (Children speak, teachers demonstrate, edge to edge, diagonal, there are two ways)
4 show the rectangle, the teacher asked: how to divide it? What's the difference? (Children speak, teachers demonstrate, long side is divided into long side, short side is divided into short side, diagonal three methods. )
Teacher: (showing the circle) Let's see which one is bigger than the original one. The back (the original size) is exactly half of the original size, which we call the whole half (teacher's gesture demonstration).
Third, the game "Find a friend" (play music and find a friend with a graphic VcR).
1. Now let's play the game of finding friends. In the game, everyone takes half of a graphic and follows the music to find the other half. When you find it, you should say: I am a half circle, and I am also a half circle. Together, we are a circle.
2, the child's game, the teacher judges whether the child is right and whether the language is complete.
Fourth, children's collective activities: intellectual rush.
The first group: homework sheet, graphic equal division;
The second group: looking for a picture according to the shadow;
The third group: draw the other half of the figure;
Group 4: jigsaw puzzle.
"Divide graphics equally" large class teaching plan 3 activity goal:
1. Learn to divide squares and rectangles into equal parts in various ways.
2. You should know that some graphics can be divided into four parts, and some graphics cannot be divided into four parts.
3. Willing to try and explore various camping methods.
Activity preparation:
Teaching aids: teaching courseware, teaching wall chart 32-4, cake cards, circular, square, rectangular, elliptical, trapezoidal, diamond-shaped paper, scissors and pens.
Learning tools: children's books p8 and P9, graphic cards, circular, square and rectangular graphic pieces of paper, scissors and pens.
Activity flow:
First of all, understand the meaning of equal division.
1, watch the courseware to stimulate children's interest.
2. The story of bears sharing cookies.
(1) Teacher: Have you heard the story of a bear sharing a cake? What does this story tell us?
(2) Encourage individual children to introduce stories, and teachers should supplement them appropriately.
3. Help the bear divide the cake.
(1) Show me a round piece of paper. Teacher: Two little bears have found another quick cake. Can you help them divide it into two equal parts?
(2) Encourage individual children to demonstrate sub-circles.
(3) Teacher: How do you know that the two halves are the same size?
(4) Guide children to compare the sizes of the two halves.
Second, solve the problem.
1. Help Mase's mother divide the cake.
(1) Teacher: Today, Mase's mother made several cakes with different shapes. What shapes are some?
(2) Show round, rectangular and square cake cards and encourage children to talk about it.
(3) Ask individual children to introduce their own points and guide them to understand the differences of their peers.
Divide the cake into four equal parts.
(1) Let the children take out the cake picture card from the picture card and try to cut it by themselves.
(2) Teacher: How to divide the round cakes? Are the four cents the same size?
(3) Let children show and introduce the results of division, and encourage children to compare whether the four cakes divided by overlapping method are the same size.
Focus on guiding children to explore different sub-methods, and ask individual children to show their own sub-methods, and try to express them completely in language.
Third, operation and expansion.
1. Show the teaching wall chart and introduce the operation contents.
(1) Divide the cake: guide children to record their own segmentation results by drawing.
(2) Circle quartering: Guide children to judge which quartering is by visual inspection or hands-on cutting, and circle the figures to be quartered.
(3) There are many kinds of quartering methods: encourage children to draw different quartering methods for the same figure.
2, children's operation, teacher observation and guidance.
3. Thanks for the evaluation.
Show the graph paper, ask the children to introduce which graphs can be divided into four parts, and demonstrate how to divide them into four parts for teachers and children to check together.
Fourth, experience summary:
For the sake of fairness in life, we often use equal division. I hope that children can apply the equal division method we learned today to their later lives, so that they can divide quickly and fairly and avoid unpleasant quarrels.
Verb (abbreviation of verb) activity extension: share food.
Teacher: Mother Bear wants to give you some food to thank the children for helping her baby bear. Please divide the food that can be divided into four parts. And give it to the guests and teachers to share. You can't share dormitory food with your partner.
Reflection after class:
All the children in the class have learned dichotomy. In the process of organizing learning, I found that children are very interested in dichotomy and have the desire to continue learning, so I designed this activity on the basis of children's learning dichotomy.
Before designing this activity, I considered the interest of the activity. Even the children in the big class, how to learn to learn and learn the graphic quartering in happy games? Therefore, I chose the way that the story runs through the situation, and used courseware and animation to stimulate children's desire and interest in learning. Judging from the whole activity scene, the children showed positive performance, strong interest, serious participation and bold exploration. In addition, in the process of learning quartering, teachers guide children to learn quartering step by step in the process of exploration and hands-on operation. From simple circle to square to rectangle, step by step, following the law of children's learning and development. In the process of sharing the quartering method, teachers pay attention to guiding children's habit of expressing as a whole and promoting the development of children's language logical thinking ability. From this, the teacher also helped Bear to find ways to let the children know how to help others, know how to share, and experience the happiness after helping others. In the last part, the teacher guides the children to apply what they have learned to their lives and connect them with real life.
There are also many shortcomings in the activity, such as grasping the activity time, arranging the links more compactly, and compressing the short parts again.