Teaching purpose: 1. Gradually develop good study habits of observation, thinking and hands-on operation. 2. Different formulas can be listed according to the information provided. 3. Can correctly calculate the addition and subtraction of "8" and "9". Teaching emphasis and difficulty: The emphasis is on correctly calculating the addition and subtraction difficulties of "8" and "9"; gradually develop the study habit of observing, thinking and pointing. Teaching aid preparation: courseware, flowers. Teaching process: 1. Introducer: Students, do you like skipping rope? Do you know the benefits of skipping rope? Teachers also like skipping rope. Skipping rope is a kind of exercise, and it is also one of the entertainment ways for children between classes. Today, the teacher brought you a picture of skipping rope. Teacher: Look how happy they are dancing! Look at this photo carefully. What did you find? Second, explore new knowledge 1. Calculate the addition and subtraction of "8" Teacher: After careful observation, you found so much mathematical information. Now the teacher asks a question: How many people are there? Can you calculate continuously? Try it yourself. Students try to answer by themselves.

Teacher: I think many students have written it. Who can tell me your thoughts? Teacher: Just now, the students said a lot of information in the pictures. Can I ask other math questions? Think for yourself first, then discuss at the same table. 2. Fill in one point at a time. Students begin to operate, arrange flowers and fill out forms; Teachers patrol and guide to help students with difficulties. 3. Tell me about it. Teacher: Who can say what "3+5" can mean? 4. Consolidate the exercises. On page 39 of the textbook "Try it", blackboard design: skipping rope (addition and subtraction of 8 and 9) 8012345678 876543210.

[1* * * *] 9876543210 Homework design: Draw "V" after the formula with the number 9 and "O" after the formula with the number 8. 2+7( 4+5( ) ) 5+3( ) 6+3( ) 9—9( ) 2+6( )