What needs to be understood here is that in mathematics, addition and multiplication can be transformed into each other under special circumstances, and the multiplication formula is a simple operation on the special addition formula. Six-ten-six-ten-six = 24 = 4× 6, which means the result of adding four sixes. Where "6" is called the same addend, the number of the same addend is four, and it is written as 4×6.

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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.

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.