1, initially feel the addition and subtraction of 3 numbers, and can calculate the number.

2. Be able to think positively and improve understanding and calculation ability.

3. Cultivate a sense of cooperation, like to participate in mathematical calculation activities, and experience the success and fun of the activities.

4. Further improve children's interest in mathematics activities and practical ability.

5. Let children realize that there is mathematics everywhere in life.

Activity preparation:

1. Teaching AIDS: RMB simulation, several supermarket supplies, donation boxes, people badges, statistical grids, title cards, receipts, red flags, prizes, shopping baskets and 6 plastic bags.

2. School tools: simulation of RMB, pencils and exercise books.

Activity flow:

I. Preparatory activities

1, the teacher and the children say hello and go.

Teacher: Good afternoon, children! There are many visiting teachers in the teacher's room today. Say hello to them. Well, after greeting, don't look at the guest teacher. Turn around and make friends with teacher Chen. Mr. Chen will take you to a very interesting place today.

Teacher: Hello, this is Manager Chen from Hao Hao Supermarket. Today, I am here to invite children to participate in the "supermarket winner" game competition held by our supermarket. Would you like to attend?

Teacher: Let's line up first, stand on the safe passage clockwise, stand on tiptoe and walk quietly to the supermarket.

2. Online Games: Happy Bus

Teacher: What a good supermarket! There are so many fitness equipment! Hey, there is a toy car! Shall we play a game of driving first?

Teacher: This is the "Happy Bus" to Beijing. Children who have been touched by me, please get on the bus first.

Teacher: Sit tight, children. My bus is about to leave. Beep, beep. How many people are there on the bus now?

Teacher: Sit tight, children. My bus is about to leave. Doodle, doodle, you come up quickly. How many people are there on the bus now?

Teacher: Sit down, children. My bus is arriving at the station, beeping, beeping. Please get off. How many people are left in the bus now?

Second, collective activities.

1, learn to add three numbers.

Teacher: Our game is about to begin. The children have put on the badges of "father", "mother" and "baby". Please choose the badge with the same color as yourself to form a happy family of three. In addition, please choose the corresponding family code according to the color of your badge and sit down gently.

Teacher: The game officially begins! I prepared 20 yuan's reserve fund for every family. The rule of today's competition is that the family that uses money reasonably and finishes the work fastest is our champion family. Now, please send a member of each family to collect the reserve fund.

Teacher: We are going to start shopping. Please go to the supermarket to buy three things and go back to your seat after checking out.

(Free shopping and music for families with three children)

Teacher's play: Dear customers and friends, welcome to a good supermarket. As it is the off-duty time and shopping peak, people are crowded. Please take good care of the baby and manage your belongings. I wish you all a happy life! Thank you)

(Families line up to pay the bill)

Teacher: Please tell each family separately, what did you buy?

Teacher: How much did the three things we bought cost?

Teacher: Oh, I have bought the bill just now, but Manager Chen wants to know how you worked it out. The first round of the "supermarket winner" challenge has begun! Please send a member of each family to work out how much you spent on three items on the blackboard. In this link, which group of families finish the work first is the first round champion!

(Guide children to operate together and calculate continuously. Choose a temporary leadership family and hang a red flag. )

Teacher: How did you work it out? Why use this method? What do you think in the process of calculation?

(Guide children to say their own calculation ideas)

The teacher concluded: It's really good. To calculate the cost of three projects, please add them up with three numbers.

2. Learn how to add and subtract three numbers.

Teacher: On March 1 1, a major earthquake occurred in Japan, which triggered a tsunami, causing heavy casualties and property losses. People all over the world lend a helping hand to help Japan tide over the difficulties! My friends, are you willing to help the affected Japanese?

Teacher: OK, a good supermarket is holding a fund-raising activity. Please give your love to help those poor people. There is no limit to the amount of donation, that is to say, you can donate as much as you want. However, donations are also needed. Please record your donation amount on the blackboard after donation.

(Donations and records) Teacher: Thank you! How thoughtful of you! Thank you, people affected by the disaster will thank you! Thank you, you are an angel of love! )

Teacher: Attention, please. 20 yuan reserve fund, supermarket shopping spent some money, donation spent some money, how much money is left? How should I calculate it? This is the second round of the "supermarket winner" competition. Please send a member from each family to show their talents.

(Guide the children to calculate together, choose the leading family, and hang the red flag)

Teacher: How did you work it out? Why use this method? What do you think in the process of calculation?

The teacher concluded: Oh, you are really amazing. I think so too. If you want to know how much money is left, you have to use the total amount of money, subtract the money you spent the first time, and then subtract the money you spent the second time. This is what we are going to learn today.

Third, group activities.

Teacher: There is not much money left in each family, but there are still many things to do. What do we do (children: make money)

Teacher: OK, there are some jobs in the supermarket that need your help. This is the third round of competition. Which family can finish the work first will win a red flag for your family.

Power group: the toy cabinet in the supermarket is broken, so it takes some effort to tidy it up. Because you are a power group, please work out the calculation problems in each circle, put them on the' ring doll' with the same number and connect them with lines.

Smart Group: It's time for the supermarket to settle accounts again. Please use your wisdom to help manager Chen work out the results of these bills.

Children's work, teachers' inspections, inspections. Choose the leader of the third round and raise the red flag. )

Fourth, exchange and summarize, prolong life and bid farewell to teachers and children.

1, select champions and award prizes.

Teacher: So, which family is the big winner in the supermarket today? Ok, let's congratulate today's champion family with warm applause! All right, let's start awarding prizes now.

Teacher: You can only choose one champion. The family that didn't win the championship is not so bad, you are the best! Come on, improve your calculation speed in future study, and taste the taste of winning the championship, ok?

2. The contest of "Big Winner in Supermarket" is over. When children go home, they can also help their parents keep a good record of family income and expenditure and be a small financial housekeeper!

Teaching reflection:

Applying what you have learned is the ultimate goal of learning mathematics. In the practice session of this class, I designed an open question to let students talk about the problems of addition and subtraction in daily life? According to the students' answers, then solve the problems in succession. This link expands students' creative thinking, and students can express their opinions, and the questions raised are novel and practical.

Encyclopedia: Addition is one of the four basic operations, which refers to the operation of combining two or more numbers and quantities into one number and quantity. The symbol of addition is the plus sign "+". Connect items with a plus sign when adding.