Case background

? In order to seriously implement the policy of "no teaching" and effectively guarantee the teaching effect during the epidemic period, Jiangxi Education Cloud-Jiangxi Education Resources Public Service Platform makes full use of the online teaching platform of primary and secondary schools in Jiangxi Province, and under the strict organization of provincial leaders at all levels, it brings together outstanding teachers from all over the province to participate in recording and broadcasting quality courses. I am also honored to undertake the online course of 10. The course taught this time is the second lesson of "Fun of Mathematics" in the primary school of Beijing Normal University.

learning target

Knowledge goal: get information from the game and experience the characteristics of the learned three-dimensional graphics.

Ability goal: in the activities of "stacking" and "playing", accumulate experience in graphic characteristics and use mathematics to solve problems. And use the digital addition and subtraction within 10 to solve the problems in the game and try to find the winning strategy.

Emotional attitude and values goal: experience the happiness of using mathematics in the game and stimulate the interest in learning.

Key points: Be able to understand the characteristics of cuboids, cubes, cylinders and spheres.

Difficulties: Learn to solve simple practical problems with mathematical knowledge.

Teaching methods: lecture method, lecture method and simulated classroom.

teaching process

First, the introduction of new courses.

Hello, children! We meet again. Miss Yang is very happy to study math with you. The class will begin soon. Are the school tools needed for this course ready? Let's start our class! Children, the teacher usually sees that you all like to play games. Today! Let's play games together. First, let's play a bunch of games. Let's see which objects in life are used in this game.

(Student recording: I saw the pencil case, flashlight, medicine box, small paper box, gift box, teapot, glue stick, ball, Rubik's cube and small speaker).

The design intention is to start with the daily necessities that students can usually see and touch, so that students can feel that mathematics is around and stimulate their desire to learn mathematics.

Teacher: Wow! There are so many objects, so what are their shapes? Please classify them according to their shapes.

(Student recording: Teacher, I classify it like this: pencil boxes, medicine boxes and gift boxes are all cuboids; Cartons, Rubik's cubes and small speakers are all cubes; Flashlight, teapot and glue stick are all cylinders; The ball is a ball. )

Teacher: It's very kind of you to say so! What are the characteristics of these objects?

(Student recording: Cuboid is long and square; A cube is square; The cylinder is round and equally thick from top to bottom; The ball is round and can roll around. )

Teacher: It seems that children have a good grasp of the characteristics of three-dimensional graphics.

Second, pile up a pile

Next, we play games with the above objects in pairs to compare which group piles up faster and higher. Children all know that playing games means obeying the rules of the game! Now let's listen to the rules of the game!

Rules of the game: (1) Use 10 objects.

(2) Stacked works should be creative.

(3) The team that piles up quickly wins.

Game 1: Go for a ride

Can you understand the rules of the game? What are the main points mentioned in a bunch of game rules? Yes! There are three o'clock. Expected 1. 10 objects. 2. The piled works should be creative. 3. The team with fast and high stacking speed wins. It seems that you all understand the rules of the game. Now start piling! The teacher is so happy to see the students getting together. I'll give you a compliment.

Let's see how the children in the video are piled up. (Students watch how the classmates in the video are built. By watching the video, the teacher found that the victory of the first group had a great relationship with their division of labor and cooperation. Did you find anything in the game? Please talk in the group.

Let the students talk about their findings fully. )

? Wow! You found so much. Let's listen to the children in the video. What did they find?

? Children, did you find what they found? It seems that you are really smart children. We won the joy of winning the team by piling up a bunch of games; I also know that according to the characteristics of three-dimensional graphics, we should put the big one below and the small one above; The ball rolls easily and should be placed on it; Cylinders and cuboids should be placed vertically as far as possible, so that the piled works will be fast and tall. After class, you can continue to play a bunch of games with your good friends and see whose works are not only creative, but also piled up quickly and high, ok?

The design intention is to let students perceive and sum up experience in a bunch of games, so as to further understand the characteristics of graphics and learn to use the characteristics of graphics to solve practical problems. Through group cooperation, cultivate students' ability of cooperation and communication, realize that unity is strength, and cultivate students' collective spirit.

Third, have some fun.

? Next, let's continue the second game "play"! What do we need to use in this game? Yes! Poker! Do you all know these playing cards? You see, there are four groups, and each group consists of A, 2 and 3 in turn 10. In today's game, these four "A's" all represent the number 1. Children: Do you all understand? Poker games also have rules. Let's listen to the wise grandfather introduce the rules of the game!

? Children, do you know the rules of the game? Got it! Then the teacher will see if you really understand the rules of the game. At the moment, they are playing a card game. Let's look at their card-touching situation first!

? All four children touched the cards just now. Look who was eliminated in the first round. Oh! Good idea! Why? That's right, because the sum of her four cards is 14, 14 is greater than 10, and the result is greater than 10 and she is eliminated. It's a pity, children. Just now we solved the problem with calculation and addition (blackboard writing).

Who won the next three children? It's Keith. Why? Because the sum of their three strokes is 9, 7 and 8 respectively, Zisi got the biggest result, so he won. But brave and naughty want to challenge and ask questions. How many times can you win if you continue to touch cards? Please think about it. Everyone's ideas are good!

? Let's listen to naughty ideas! Can you touch 1? Let's look at 8+ 1=9. At this time, Kiki and the naughty boy had the same result. Well, who won this time? Yes! The result is the same, whoever touches fewer cards wins. Yes, Keith still won. How many naughty touches can you win? Please use your head to help naughty people think about it!

Smart smile and talk! It seems that the card-touching game is not only fun, but also interesting! Let the children play card games in groups of four. The teacher was very happy to see the children win the card-touching game. I'm so happy for you! Now let's take a look at the card-touching game of four children in the video! It seems! Poker games are also inseparable from mathematical calculations. Learning math well will make our game more interesting.

The design aims to let students further master the addition within 10 in interesting poker games, and at the same time, cultivate students' thinking ability, be flexible in response, and use ingenious methods to deal with practical problems in life. Cultivate the skills of life learning.

Fourth, class summary.

What did you get from this lesson?

? By playing "heap" and "play" games together, we can get mathematical information from the game, experience the characteristics of the three-dimensional graphics we have learned, solve the mathematical problems in the game through addition, and the children will try their best to find the "secret" of winning the team! It seems that you have gained a lot. Today, this class will be over. Please prepare the study clock for the next class. The teacher looks forward to your wonderful performance in the next class. Goodbye, children!

Teaching reflection

? "Playing games together" is mainly composed of "heap" and "play". In these two activities, students need to accumulate graphic features and experience in solving problems with mathematics, initially cultivate their sense of numbers, get mathematical information from the game, realize the characteristics of the three-dimensional graphics they have learned, solve problems with addition and subtraction of numbers within 20 in the game, and try to find a winning strategy. At the same time, they hope that students can experience the fun of using mathematics in the game.

Students are very excited to hear playing games, especially the children in Grade One are more active. If it is controlled in the usual classroom, they obviously can't do it. Fortunately, students can actively participate in the game through online classroom interaction mode.

The link of "stacking" is relatively simple. Students can pile up all kinds of interesting graphics and understand the characteristics of each graphic. The link of "playing" is complicated because of the rules. Students need to understand, so they will spend more time to understand the topic. When students understand, they will play games more happily.

In this class, I saw the energetic scene of the children in grade one, and I couldn't help but sigh: playing games with the children makes me much younger!