Division is an operation learned in the second grade of primary school, which is included in the four operations. Four operations are the most basic arithmetic operation rules in mathematics, which originated very early and appeared almost when mathematics was just founded.

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1, the order of elementary arithmetic is: when the same level of operation, it is calculated from left to right in turn; Two-stage operation, first multiply and then divide, then add and subtract. When there are brackets, count the inside of brackets first, and then count the outside of brackets; When there are multiple brackets, count the brackets first, then the brackets inside, then the braces inside, and finally the brackets outside.

2. Multiplication is a simple operation of addition and division is a simple operation of subtraction. Subtraction and addition are reciprocal operations, and division and multiplication are reciprocal operations. When several addends are added, the positions of addends can be exchanged at will; Or add a few addends first and then add them with other addends, and the sum remains the same. Subtracting the sum of two numbers from a number is equivalent to subtracting each addend in the sum from this number in turn.