Operation sequence is the most important part of mixed operation teaching. In the practice of mixed operation, students often make calculation mistakes because of unclear operation sequence. Therefore, teachers should not only simply tell them the operation sequence, but also skillfully use the idea of comparison to internalize the essence of knowledge in students' minds.
Hybrid algorithm
(1) If there is only addition and subtraction in the formula, it will be calculated in turn; Only multiplication and division are calculated in turn.
(2) There are both addition and subtraction and multiplication in the formula. Multiplication first, then addition and subtraction.
(3) There are both addition and subtraction and division in the formula. Calculate division first, then add and subtract.
(4) The parts that are not involved in calculation in each step should be copied down with the same position and symbols to ensure that the equal sign is equal before and after.
(5) The function of parentheses in mixed operation is to change the operation order. Operation sequence of mixed operation with brackets: first calculate the inside of brackets, then calculate the outside of brackets.