The counting method of 1. natural numbers is based on decimal system.
That is, the radix of each number system is 10. In this system, 10 different numbers (0-9) are used to represent any number. Each number represents a different "bit", from right to left (that is, from the lowest bit to the highest bit), which is one bit, ten bits, one hundred bits, one thousand bits, ten thousand bits and so on.
2, digital decomposition into different
Divide the number into different bits, and the number on each bit represents the number of beads placed on that bit. The number 357 can be expressed as 3 *102+5 *101+7 *100, that is, 3 hundreds, 5 tens and 7 digits.
3. Ten in one
When the number of a bit reaches 10, the bit will move to a higher position, and at the same time, the number on the bit will become 0. When the number on the unit reaches 10, it becomes 10, and the tenth digit is added with 1.
4. borrow one from ten
When the number of a bit exceeds 9, the bit will borrow one from the high order, and the number on the bit will decrease by 1. When the number in the tenth place is 12, it will become1*10/+2 *100 =12, that is, the number in the tenth place is negative 2. This counting method can be used to represent integers of any size, and operations such as addition, subtraction, multiplication and division can be conveniently performed through different combinations of numbers.
Four Counting Methods of Natural Numbers
1, arithmetic operation
Mathematically, the number and size are expressed by counting natural numbers, and various arithmetic operations are carried out.
2. Counting system
In computer science, we use different counting systems such as binary, octal and hexadecimal to store and transmit data, among which binary is one of the most commonly used counting systems.
3. Exchange value
In economics, we use the counting method of money to express the quantity and exchange value of money. Dollars are counted in decimal.
4. Representation of indexes
In physics, we use scientific symbols to represent very large or very small numbers, where the exponent represents the order of magnitude of the number. The speed of light is 3 * 10 8 m/s.