40000000/30≈ 1333333, 1333333/7000≈ 190。 Arithmetic is the oldest, most basic and primitive part of mathematics. It studies the properties and operations of numbers.

The oldest mathematics, arithmetic, is formed by accumulating and sorting out the properties of numbers and the experience of four operations between numbers in the application process. 40000000/30≈ 1333333, 1333333/7000≈ 190。