1 5: 1x5 = 5，5: 2x5 = 10 25 10，3 5: 3x5 = 15 35 15，4 5: 4x5 = 20 4520，5: 5x5 = 25 5525。
Knowledge expansion
Learning mathematics is a task that requires patience and perseverance. Here are some suggestions to help you learn math better:
1. Establish a solid foundation:
Mathematics is a discipline gradually established, first of all, we must ensure that we have good basic knowledge. Review and consolidate basic arithmetic, such as addition, subtraction, multiplication and division, as well as various mathematical concepts and terms.
2. Understanding concepts rather than mechanical memory;
Mathematics is more than memorizing formulas and operation methods. Try to understand the principles behind the concepts and master their uses and meanings. In this way, you will be more creative and flexible in solving problems.
3. Deliberately practice:
Mathematics needs constant practice. Consolidate your knowledge and skills through a lot of practice. Try to choose exercises with different difficulties so as to be able to deal with various types of problems.
Ask for help:
Don't be afraid to ask for help if you encounter difficulties or don't understand a concept. You can consult teachers, classmates or mathematicians, and you can also consult related books and online tutorials.
5. Cultivate the way of thinking to solve problems:
Mathematics has taught us the way of thinking to solve problems, that is, the ability of logical thinking and analysis. Try to apply mathematics to real life, solve practical problems and cultivate your ability to solve problems.
6. Pay attention to the thinking process:
In the process of solving problems, pay attention to your own thinking process, find your own mistakes and shortcomings, and improve them. Pay attention to the logic and organization of thinking, so as to clearly show your own problem-solving ideas.
In a word, it takes time and energy to learn mathematics. By mastering basic knowledge, strengthening practice, actively seeking help and cultivating the way of thinking to solve problems, you will be able to build a solid mathematical foundation and improve your mathematical level.