The position of these counting units in numbers determines their weight in numerical expressions. For example, in decimal numbers, the number on the left represents a larger number, while the number on the right represents a smaller number. Therefore, when we read a number from left to right, we are actually reading the units of different sizes contained in this number.
These counting units are widely used in mathematics, statistics, economics and many other fields. For example, in statistics, we often use thousands, tens of thousands, billions and other units to describe large-scale data; In economics, we use thousands of dollars, 10 thousand dollars, hundreds of millions of dollars and other units to describe great wealth.
The purpose of the counting unit:
1, convenient for numerical calculation and understanding: numerical calculation and understanding can be more convenient by using counting units. For example, when we shop, we usually use money as the unit to calculate the price and the amount of payment. Similarly, in the field of scientific research and engineering, the standard counting units (such as meters, kilograms, seconds, etc.) in the International System of Units (SI) are used. ) can simplify calculation and improve readability.
2. Describe and analyze large-scale data: In statistics and big data analysis, using counting units can effectively describe and analyze large-scale data. For example, in population statistics, we usually use thousands, tens and billions as counting units to describe the population quantity and distribution. Similarly, in environmental science, counting units can be used to describe and analyze the species and quantity of organisms in the environment.
3. Compare the scale and importance of different things: Using counting units can compare the scale and importance of different things more intuitively. For example, in political and social sciences, the population and economic growth rates of different countries or regions can be compared in units of millions, tens of millions or billions. Similarly, in daily life, we use counting units to compare the prices of different products and housing prices in different cities.