The fourth-grade counter is usually a simple manual mathematical tool to help students understand and master basic arithmetic concepts, such as addition, subtraction, multiplication and division. The appearance and design of the counter may vary according to the brand, model and use, but it generally includes the following main parts:

Display screen: The display screen of the counter is usually a small LED or LCD screen, which is used to display the current value and operation results. The resolution and size of the display screen may vary from model to model, but numbers and various mathematical symbols can usually be clearly displayed.

Buttons: Buttons of counters usually include numeric keys, operation keys and function keys. Numeric keys are used to input numbers, operation keys are used to select basic operations such as addition, subtraction, multiplication and division, and function keys are used to perform specific mathematical operations, such as clearing, summing and averaging. The design and arrangement of buttons may be different due to different models and brands, but they generally conform to the conventional mathematical operation habits.

Internal structure: The internal structure of a counter usually includes a microprocessor and some memories for performing mathematical operations and storing data. The internal structure of the counter may vary according to the model and brand, but it generally has basic mathematical calculation and data storage functions.

Power supply: counters usually use batteries or rechargeable batteries as power supply to ensure long-term use and portability. The design and use of power supply may vary according to the model and brand, but it usually takes a long time and consumes low energy.

In addition to the above main components, the four-level counter may also have other functions and characteristics, such as:

Phonetic counting: Some high-end counters may have phonetic counting function, which can automatically read the current numerical values and operation results when students perform mathematical operations, and help students better understand and master mathematical knowledge.

Multi-function display: Some counters may have multi-function display function, which can display the results and processes of multiple mathematical operations on the display screen at the same time, which is convenient for students to carry out complex mathematical calculations and analysis.