Activity objectives:
1. Try to arrange three numbers in different ways and learn several ways to sort numbers.
2. Make active use of the existing sorting experience to speculate.
3. Be able to think actively and flexibly.
4. Cultivate children's spirit of trying and develop their agility and logic.
5. Stimulate children's interest in learning, experience the happiness of mathematics activities and feel the fun of collective activities.
Activity preparation:
PPT, pen, paper
Activity flow:
Let's talk about the introduction first and stimulate the division of interest: we are from Longyan. Speaking of Longyan, we often hold some interesting activities in Longyan, such as auto show. Today, we will talk about a topic about cars. Teacher Lan wants to know first, do you have a favorite car?
Second, the game "Go to the Auto Show"
Teacher: Let me tell you a secret. There is a new auto show in Longyan. There are many cars you haven't seen in this auto show. Shall we go to visit together? Where is the auto show? I don't know. The two children are going to the auto show. Let's go with them! Before we went, they said that our sophomores were very smart and wanted to give the big class a question. If the answer is correct, they will take you there. Children, do you accept their challenge? Let's see what the problem is! What do you see?
1. Question: 1.2.3 Three numbers line up. How many different ways are there?
2. Teacher: Here are three numbers: 123. Please line up. Every method will flash a star. If you want all five stars to shine, let's start.
3. The teacher helps the children to clarify the rules.
Teacher: There are three numbers, 123. A * * *, how many permutations are there? Did you find any secrets in these six different arrangements?
Summary: The original three numbers have six permutations. Each permutation, three numbers can take turns to be leaders, and each number has two permutations when it is leaders. The leader remains the same, and the next two numbers switch places. (123, 132, 23 1, 2 13, 32 1, 3 12) Teacher: OK! All five stars are saved! You can go to the auto show! What did you find?
Third, the game "Watch the Auto Show"
Teacher: There are three motorcades here. Can you see which three teams they are? Red, yellow, green and three teams have brought their newly developed new cars. How can we see their new cars?
Teacher: As you said, there are numbers with question marks, three colors and three teams. Just guess the number in the question mark and you will see the new car.
(1) red team-(mini-car) new type of environment-friendly car (123. 132.438+03. ) Teacher: Look at the red team first. Which one has a question mark? What number should be behind the question mark? After the correct answer, let's see what car the red team brought us. The red team brought a mini-car, which is a new type of environment-friendly car.
(2) Yellow Team-Amphibious Vehicle (456.465. Teacher: We just saw that the Red Team is a mini-car. What car is the yellow team? Let's see which car of the yellow team has a question mark first. Tell me what number should be with a question mark, and tell me your reason. Just now, when we watched the red team, we saw the queuing rules of the car numbers on it. When we look at the yellow team, we should not only look at the queuing rules of the numbers above, but also look at the queuing rules below. Let's take a look at the yellow team's car. This kind of car can travel in water or on land, so it is called amphibious car.
(3) Green Team -RV (123.345.567. ) teacher: let's look at the green team again. Which one has a question mark? What number should it be? This time, we should look at the pattern and see how the cars in front are arranged, up and down. The more numbers we look at, the more information we get and the more correct answers we get. Let's take a look at the car brought by the green team. Let's see what's in the car. Who wants an RV?
Help children sort out the rules.
Fourth, the game "deals"
1. Question: Can these cars drive directly to the road? Why? Why can't you drive to the road? What is missing? You will see a blue sign in the front and back of the car. This is called a license plate.
2. Question: What do you see on the license plate? Numbers, letters and Chinese characters. What does "Chinese characters" mean? Fujian means that this car belongs to Fujian.
3. Summary: The license plate represents a car and there is no repetition.
4. Question: I will give you different numbers in the license plate competition. Please combine them and see how many licenses can be compiled.
Teacher: Play with the license plate. There are three teams, red, yellow and green. Which team do you want to go to help get the license plate? Each group will give you a few numbers. Please line up with these numbers later. By discharging a set of methods, you will have 1 license plate. The more ways to discharge, the more license plates you get. The numbers on it can't be more or less, and they can't be repeated. There are no identical license plates on the road.
5. Sort out the courseware and sort out the license plates designed by children.
Teacher: How many permutations are there for three numbers * * *, and how many permutations are there for four numbers? Let's practice how to arrange the four numbers 1 as the leader and 1234. How many arrangements are there when the rest of the graphics are at the front? I'll leave this to the teacher in the big class to practice with you. When you get the answer, come to Class Two and tell Miss Lan, OK?
Activity reflection:
In terms of material selection, the outline points out: "Guide children to be interested in the phenomena of number, quantity, shape, time and space in the surrounding environment, establish a preliminary concept of number, and learn to solve some simple problems in life and games with simple mathematical methods." Children in large classes have been able to calculate the numbers above 100 orally, write the numbers within 10, and skillfully count and sum the numbers within 10, but the discovery of the irregular arrangement and arrangement law of numbers is somewhat vague. The "Wonderful Auto Show" activities fully mobilize children's initiative in learning by visiting new cars of various brands, looking for the rules of number arrangement, judging and designing the license plate number of new cars and other interesting game links. Let children learn to arrange three numbers in different ways in real situations and in the process of solving problems, find out the arrangement rules, and further help children consolidate their understanding of logarithmic concepts. At the same time, by understanding the wide application of number arrangement in life, we can feel the magic and beauty of ever-changing number arrangement and realize the significance of learning mathematics. In a pleasant learning atmosphere, feeling the happiness of mathematics activities reflects the integration of mathematics, cognition and other fields.