For example, addition needs subtraction and division needs multiplication. Calculate A+B = C, check C-B = A, and operate. Mathematically, operation is a behavior, and new quantities are obtained through possible combinations of known quantities. The essence of operation is the mapping between sets.
The addition check calculation in primary school mathematics is to use the opposite method of addition and subtraction to check the calculation. For example, 12+24=36, then 36-24 can be used to calculate the result. If it is equal to 12, then the calculation is correct.
definition
Addition: the operation of combining two numbers into one number.
Subtraction: when two addends and one of them are known, the operation of finding the other addend.
Multiplication: the operation of finding the product of two numbers.
Division: the operation of finding another factor by knowing the product of two factors and one of them.