Addition is one of the four basic operations, which refers to the calculation of combining two or more numbers and quantities into one number and quantity. The symbol of addition is the plus sign "+". Connect items with a plus sign when adding. Addition (usually indicated by the plus sign "+") is one of the four basic arithmetic operations, and the others are subtraction, multiplication and division.

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Addition has several important properties. It is interchangeable, which means that the order is not important, it is interrelated, which means that when more than two numbers are added, the order in which the addition is performed is not important. Repeatedly adding 1 is the same as counting; Adding 0 will not change the result. Addition also follows related operations such as subtraction and multiplication.

The essence of addition: it is exactly the same thing, that is, the repetition or accumulation of similar things, which is the beginning of numerical operation. Different kinds, such as an apple and an orange, can only be equal to two fruits, so there is a relationship between classification and classification. Subtraction is the inverse operation of addition, and multiplication is a special form of addition. Division is the inverse operation of multiplication; Power is a simple form of multiplication.

Reference to the above content: Baidu Encyclopedia-Supplement