Activity goal: 1. Review scores are less than 3 for addition and less than 4 for composition. 2. By creating a scenario, let the children try their own addition formula of 4 during the operation. 3. Make children further understand the exchange relationship between the two parts. Activity preparation: Add formula cards and digital cards within 3 minutes, 4 pictures of apples and pears, 4 radishes and 4 flowers for each child, and arrange the activity scene. Activity flow: Play finger games with music that dances with ten numbers. First, the number of comments is the addition of less than 3, the composition of comment 4 is 1, and the number of comments of the game "Driving a Train" is the addition of less than 3. The children in our class like watching cartoons very much. Have you seen the program Animation City? There is a scarab sister in the cartoon city smart house. She invited us to visit the smart house today. She wants to see who is the cleverest child. Now let's go to the smart house! How to get there? Let's go off! What time does our train leave? (showing the addition card) Hey, hey! What time does our train leave? Our train leaves at two o'clock. 2. Review composition of the game "There are apples and pears" 4. Export the game "There are apples and pears". How many pears are there in an apple? (3).3. The children were really right about the game Logarithm just now, and the teacher came to test you. Let's log, raise your little hand, I'll give 1, how much do you give? (3), 1 and 3 add up to 4. Second, create a scene and try to write an addition formula with the number 4 in operation/jiaoan/zhongban/7891.html.