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.

Addition is one of the simplest digital tasks. The most basic addition: 1+ 1 five-month-old babies and even other animal species can be counted. In primary education, students are taught to calculate the superposition of decimal numbers, starting with one digit, and gradually solving the more difficult number calculation.

interpret

Addition has been used to establish countless physical processes. Even in the simple case of adding natural numbers, there are many possible explanations and more intuitive expressions.

combine

Perhaps the most basic explanation of addition lies in the combination of:

When two or more disjoint sets are merged into one set, the number of objects in the set is the sum of the number of objects in the original set.

This explanation is easy to imagine. It is also suitable for advanced mathematics; For a strict definition of its excitation, see the following natural numbers.

One possible solution is to consider a set of easily divisible objects, such as pies. Rods can not only form a set of rods, but also connect rods together, which explains another concept of addition: not adding rods, but adding the lengths of rods.