I said that first-grade mathematics and third-grade mathematics are easy to teach. First of all, we should try our best to grasp the teaching materials and use them to understand the children's learning situation. The children in grade one are still in the stage of thinking in images, so the teaching should be intuitive, and the students in grade three should gradually change from thinking in images to thinking in abstractions. Teaching should be based on the law of children's thinking development, and it is natural to teach children to fall in love with mathematics.