Addition, subtraction, multiplication and division are called elementary arithmetic. Among them, addition and subtraction are called first-order 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.

Extended data

1, addition and subtraction

For example: 4 (addend) +3 (addend) =7 (sum)

Given the sum of two addends and one of them, the operation of finding the other addend is called subtraction.

2. Subtraction is the inverse of addition.

In subtraction, the sum of two known addends is called minuend, the known addend is called subtraction, and the required addend is called difference.

For example: 7 (minuend) -3 (minuend) =4 (difference)

Baidu encyclopedia-elementary arithmetic

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