The 0-9 number keys on the calculator keyboard are used to input numbers. Among them, the number key "0" is usually displayed as a circle instead of the usual 0 character.

The decimal point key on the calculator keyboard is used to enter decimal points. In the scientific calculator, you can use the decimal key to switch between different mathematical modes (for example, decimal or fraction).

The operation symbol keys on the calculator keyboard include plus sign, minus sign, multiplication sign, division sign, percentage sign, equal sign, unequal sign, power, square root and inverse. These keys can be used to input various mathematical operators and functions.

The equal sign key is used to display the results of operations such as adding or multiplying two values on the screen. After pressing the equal sign key, the calculator will immediately perform the corresponding operation and display the result.

Backspace key is used to delete the entered number or operator. After pressing the backspace key, the entered number or operator will be deleted.

Function and significance of calculator

Calculator is an electronic device used to perform basic mathematical operations, including addition, subtraction, multiplication, division, roots and exponents. Its function is to help people perform various mathematical calculations quickly and accurately, and improve the efficiency of work and study.

Calculators play a very important role in modern society, especially in science, engineering, finance, medicine and other fields.

For example, in scientific research, a large number of numerical calculations are needed; In engineering design, accurate measurement and calculation are needed; In the financial field, complex financial analysis and prediction are needed; In the medical field, various pharmacological and biostatistics calculations are needed. In these fields, the use of calculators can greatly improve work efficiency and accuracy, and reduce the occurrence of human errors.

In addition, calculators have the significance of popularizing education. In school, students often need to perform various mathematical calculations, and the use of calculators can help them better understand and master mathematical knowledge. At the same time, with the development of science and technology, the functions of calculators are constantly expanding and improving. For example, there are graphic calculators, scientific calculators, financial calculators and other types of calculators, which can meet the needs of different fields.

The above contents refer to Baidu Encyclopedia-Calculator.