The practical problem of finding the difference between two numbers in the second volume of the first grade mathematics of the new Soviet Education Edition; Teaching design of blackboard writing in teaching plan This part is to find out the practical problem that one number is more or less than the other. Textbook examples use students' existing life experience to ask questions through the game of catching flowers. Through operation and discussion, help students understand how much one number is more than another when one number is subtracted from another, and then use subtraction to calculate. In addition to asking students to fill in formulas, they have to answer orally and demonstrate how to write sentences. You can also ask the students to make another statement. On the basis of thinking and discussion, let the students help them clear their minds and make sense.

Teaching objectives:

1. Through operation and reasonable reasoning, through exploration, it is found that finding one number more or less than another number is calculated by subtraction.

2. Be able to solve simple practical problems in life, and cultivate students' interest in learning and awareness of mathematics application in the process of solving problems.

Teaching focus:

Students can master the method of comparing two numbers through cooperation, observation and comparison.