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Division is one of the four operations. Given the product of two factors and a non-zero factor, the operation of finding another factor is called division. Long division: commonly known as long division, it is suitable for integer division, decimal division, polynomial division (that is, factorization) and other divisions that pay more attention to the calculation process and quotient. Both multiplication and subtraction are used in the process.

According to the multiplication table, two integers can be calculated by long division (direct division). If the dividend has a decimal part (or decimal point), just bring the decimal point down when calculating; If the divisor has a decimal point, move the decimal points of the divisor and the dividend at the same time until the divisor has no decimal point. An abacus can also do division.

Short division: commonly known as short division, it is suitable for fast division, synchronous division of multiple integers (so it is often used to find the greatest common factor and the least common multiple), binary digital conversion and so on. , pay more attention to multiple tests and division of prime factors (serial multiplication). Most processes only need to use the multiplication table of 99 and a few multiplication factors of integers above 9.

In mathematics, when the first-level operation (addition and subtraction) and the second-level operation (multiplication and division) are in the same formula at the same time, their operation order is multiplication and division first, then addition and subtraction. If there are parentheses, the order of operations at the same level is from left to right. Such operations are called four operations.

The fourth refers to the calculation rules of addition, subtraction, multiplication and division. The expressions of four operations do not necessarily have four operation symbols. Generally, it refers to the operation of combining the majority into a number with two or more operation symbols and brackets.

Addition: the operation of combining two numbers into one number/two decimals into one decimal/two fractions into one fraction. Subtraction: The operation of finding the other addend by knowing the sum of two addends and one of them.

Multiplication: A simple operation to find the sum of several identical addends. The meaning of decimal multiplication by integer is the same as that of integer multiplication. Multiplying a number by a pure decimal means finding a few tenths and a few percent of this number ... The meaning of multiplying a fraction by an integer is the same as that of integer multiplication. Division: the operation of finding another factor by knowing the product of two factors and one of them. It means the same as integer division.