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Mixed operation of addition, subtraction, multiplication and division in grade one
Add-subtract mixed operation problems should be calculated from left to right.

Addition, subtraction, multiplication and division are collectively referred to as elementary arithmetic, in which addition and subtraction are called first-level operations; Multiplication and division are called secondary operations.

operation sequence

1, same level, from left to right; 2. Two-stage operation, first multiply and then divide, then add and subtract.

3. When there are brackets, count the inside of brackets first, and then count the outside of brackets;

4. When there are multiple brackets, count the brackets first, then the brackets inside, then the braces inside, and finally the brackets outside.

5. If there is a power, calculate the power first.

6. In the mixed operation, the numbers in parentheses are calculated first, and the parentheses are from small to large. If there is a power, calculate the power first, and then from high to low.