1. Copy the questions correctly, check first and then calculate. In other words, when copying the questions, you should first check with the original questions, and then calculate them. The purpose is to prevent copying wrong numbers or wrong questions.

2. Carefully examine the questions and think carefully. In other words, you should look at the questions carefully and think carefully: look at the content and requirements of the questions and the characteristics of the numbers; Think about the problems that should be paid attention to when calculating, and whether they can be simplified. Elementary arithmetic, in particular, should be examined at different levels.

3. The handwriting is clear and neat. In other words, write clearly, even on draft paper, and write neatly. In particular, decimal points, carry points and abdication points should be clearly written and eye-catching. Formulas should be arranged neatly and conform to the specifications. The purpose is to prevent mistakes caused by graffiti.

4. Check carefully and insist on checking and calculating. In other words, after you finish the problem, you should check it carefully to see if the result is reasonable, and then check it again. Checking calculation must not be posturing and going through the motions. This is a key step to avoid mistakes.

If there are mistakes, we must correct them and take a warning. In other words, we must correct the wrong questions, carefully analyze the causes of the mistakes, sum up the lessons we should learn, find ways to prevent mistakes, and never allow us not to correct the wrong questions.