There is less mathematics within 10, and it is relatively easy to find the law, which is generally 1, 3,5,7,9. There are even numbers 2,4,6,8, 10. In addition, there are three numbers that are the same but cannot have the same number, such as 2+4+6= 12, 1+3+8= 12. Both of them are 12. The rule is that you can use your brain better.

The role of regular methods in mathematics is to improve students' learning style and gradually help students master independent thinking and active exploration based on specific content. The second is to increase students' experience of creating successful mathematics learning, so that students can gain the happiness and strength of mathematical thinking. The third is to cultivate students' keen mathematical vision and the ability to solve simple practical problems by using laws. First-year students use their brains more.