For example: 9+5, according to 9 to 1, the number 5 can be divided into 1+4, and then 1 and 9 are added to get 10, and the remaining 4 is added to 10, that is, the calculation result is/kloc-0. The calculation process is as follows.
Law of addition:
Addition has several important properties. They are interchangeable, that is, the order is not important, and they are interrelated, that is, when more than two numbers are added, the order of addition is not important. Repeated addition 1 is the same as counting, adding 0 does not change the result, and addition also follows related operations (such as subtraction and multiplication).
Addition is one of the simplest numerical tasks and the most basic addition: 1+ 1, five-month-old babies and even other animal species can be calculated. In primary education, students are taught to calculate the superposition of decimal numbers, starting with one digit, and gradually solving the difficult numerical calculation.