[Visitor (112.0.*.*)]answers [Chinese ]  Time :20191218  Arithmetic is the oldest, most basic and original part of mathematics. It studies the nature of numbers and their operations. By accumulating and applying the experience of numbers and the nature of the numbers and the four arithmetic operations between numbers and numbers, and finishing them, the oldest mathematics, arithmetic, has been formed. In ancient times all mathematics was called arithmetic, and modern algebra and number theory were originally developed by arithmetic. Later, the concepts of arithmetic and mathematics appeared. It replaced the meaning of arithmetic, including all mathematics, and arithmetic became one of its branches. 
