Grading by segment. In recent years, mathematics problem solving in senior high school entrance examination has shown the characteristics of "easy entry, difficult in-depth". The first question is easier, and the second and third questions are more difficult. Therefore, we should pay attention to "grading by sections" when answering questions, step by step. Get the first question first, make sure not to lose points, and then analyze whether the first question has prepared the thinking foundation and problem-solving conditions for the second and third questions, and strive to keep the second question and get the third question. The solution of the senior high school entrance examination in mathematics is graded step by step. If the process is simple, more points will be deducted in case of mistakes, so the intermediate process should not be too simple, so that even if there are mistakes, the points can be deducted as little as possible. If you can't write the correct result correctly because time is too tight or you only know the result, write the correct answer.