1. common factor extraction method: when extracting the same factor, the remaining items in the exam will often be added and subtracted, and an integer will appear. For example: 0.92×1.41.92× 8.59 = 0.92× (1.41+8.59).
2. Borrowing borrowing method: When using this method, you need to pay attention to observation and find the law. In the exam, when you see that 998,999 or 1.98 is close to a very easy-to-calculate integer, you often use the borrowing method. For example: 9999+999+99+9 = 9999+1+999+1+99+1-4.
3. Split method: In order to facilitate calculation, split a number into several numbers.
4. Symbol shift method: When a calculation problem has only one-level operation (only multiplication and division or only addition and subtraction) and no brackets, we can "symbol shift". For example: A+B+C = A+C+B, A+B-C = A-C+B, A-B+C = A+C-B, A-B-C = A-C-B;
5. Removal of parentheses and square brackets.