These keys are usually arranged in a grid similar to a telephone keyboard, and each number key has a corresponding number identification. Besides numeric keys, there are other keys on the calculator, such as operation keys (addition, subtraction, multiplication, division, etc. ), decimal point key, equal sign key, etc.
Let's take a closer look at these numeric keys and their functions:
Numeric keys 0-9: These keys are used to enter numbers. Press the corresponding number key, and the corresponding number will be displayed on the calculator screen. These numeric keys usually have two functions: one is to input numbers, and the other is to perform mathematical operations.
For example, we can press the number key to enter the addend first, then press the plus key, then press another number key to enter the addend, and finally press the equal sign key, and the calculator will display the operation result.
Decimal point key: this key is used to enter decimal points. In the process of using a calculator, we often encounter the need to input decimals, so we need to press the decimal point key. After pressing the decimal point key, the decimal point will be displayed on the calculator screen.
Operator keys: These keys are used to perform various mathematical operations, including addition, subtraction, multiplication, division, exponent, square root, etc. Press the corresponding operation key, and the calculator will perform the corresponding operation.
Equal sign key: this key is used to confirm the entered numbers and operators and calculate the results. After inputting numbers and operators, press the equal sign key, and the calculator will immediately calculate and display the results.
In addition to these basic numeric keys and operation keys, there are some other keys on modern calculators, such as reset key, storage key, scientific calculation key and so on. These keys can be set and used as needed to meet different computing needs.
In a word, the number keys on the calculator are one of the most basic components of the calculator, which provides us with convenient and fast digital input and calculation functions. When using the calculator, we need to be familiar with the usage of these numeric keys and operation keys to improve the calculation efficiency and accuracy.