1. If there are brackets, count the numbers in the brackets first.

2. In addition, add, subtract, multiply and divide, without brackets, first calculate multiplication and division, and finally from left to right.

3. When there is multiplication and division at the same time, it is calculated from left to right.

4. Calculate what is in brackets first, then multiply and divide, and finally add and subtract.

5. The disjoint calculation of the same number should be calculated from left to right.

Children need to understand the essence of subtraction and the method of adding and subtracting multiple digits, and master the steps of vertical calculation. In the off-balance calculation, pay attention to carefully sort out the questions, understand the mathematical relationship required by the questions, judge the calculation order and direction, clarify the carry and borrow rules between different digits, and master the left and right writing order of vertical calculation. In addition, parents and teachers need to patiently guide their children to make them more and more proficient in offline computing.