Mathematical testing means testing conditions with results. For example: 1+ 1=2, now use 2- 1 to see if it is equal to 100 but not equal to 1, then the calculation degree is established, otherwise the calculation fails. Checking the calculation can effectively find the mistakes in the calculation process, but it is of little use to solve the mistakes in thinking. By comparing the data obtained by checking calculation (deriving conditions with results) with the original data, it is suggested whether the operation is correct. Complex algorithm. That is, according to the original meaning of the problem, check the formula and calculation of each step to see if it is correct. In this method, because students can't judge the original intention of the question, they just repeat the calculation of the formula listed in the question, so they can only check whether the calculation is correct, but can't check whether the method of solving the problem is correct. Substitution method. That is, when checking, you can check whether the formula and calculation are correct according to the original intention; You can also take the number as the known number of e and calculate it step by step according to the meaning of the question to see if the result meets the original known conditions.