A four-function calculator is a basic type of calculator that performs the four fundamental arithmetic operations: addition, subtraction, multiplication, and division. Some four-function calculators may also include a few additional functions such as square roots and percentages, but they primarily focus on these core operations. This type of calculator is commonly used for simple mathematical calculations and is often the most affordable and easiest to use. It is also called a basic calculator or pocket calculator. In summary, a four- function calculator handles:

• Addition (+)
• Subtraction (−)
• Multiplication (×)
• Division (÷)

It may sometimes include square root and percentage functions as well. This kind of calculator is suitable for everyday math tasks and is also used as an accommodation for individuals with disabilities impacting their math skills in certain standardized tests. The calculator operates using basic inputs and provides quick results for these fundamental operations without the complexity of scientific or graphing calculators. This explanation aligns with definitions and descriptions from educational and accommodation-related sources.