1. Addition and subtraction of integers: In the addition and subtraction of integers, mistakes are easily made, including symbol processing and number alignment. For example, when adding two numbers, if you don't pay attention to the handling of symbols, it may lead to wrong results.
2. Addition and subtraction of fractions: In addition and subtraction of fractions, common points and subtraction are easy to make mistakes. For example, if two scores are added together, if you don't pay attention to the total score and approximate score, it may lead to wrong results.
3. Algebraic calculation: In algebraic calculation, it is easy to make mistakes, including merging similar items and removing brackets. For example, if you don't pay attention to the handling of symbols when merging similar items, it may lead to wrong results.
4. The nature of geometric figures: In the nature of geometric figures, there are angles and side lengths that are easy to make mistakes. For example, if you don't pay attention to the unit conversion when calculating the angle, the result may be wrong.
5. Collection and collation of data: In the collection and collation of data, the error-prone places include the accuracy and integrity of data. For example, when collecting data, if you don't pay attention to accuracy and completeness, it may lead to wrong results.