"How many bottles of milk" is the third lesson of Unit 7, Grade One, Beijing Normal University Edition, and it is children's initial contact with carry addition. The key to teaching is to use the method of "adding ten" to inspire students to convert 9 plus several into 10 plus several, and the thinking process of "adding ten" is the difficulty of this course. Let children initially perceive the diversity of calculation methods and understand the simplicity of the "rounding ten" method.

This lesson focuses on the teaching process of "finding problems-asking questions-solving problems". Using courseware, show the scene of 1 box containing 9 bottles of milk and 1 box containing 5 bottles of milk, and invite students to ask questions. The students thought about it and spoke enthusiastically: for example, how many bottles of milk does a * * * have? How many bottles of milk are there on the left than on the right? There are fewer milk bottles on the right than on the left. I asked the students to take out sticks, put them on the table and do some calculations to solve the problem of how many bottles of milk there are in a * * *. This question. By placing sticks and other learning tools, students can help students find solutions to problems intuitively. Everyone expresses their opinions and lists the formulas to solve the problem. The classroom atmosphere is very active, which has achieved a good effect of promoting thinking with doubt. After forming perceptual knowledge, the calculation method of 9 plus several is gradually abstracted.