Types of calculators Calculators have evolved over the last several decades. Today, there are a variety of calculators, from brands such as Casio and Texas Instruments, available to serve different mathematical needs. Let's look at a few of them. Basic calculators The most basic calculator is the four-function calculator, which can perform basic arithmetic such as addition, subtraction, multiplication and division. These are sometimes called pocket calculators or hand-held electronic calculators because they are small enough to fit in a shirt pocket. They are also the least expensive calculator, costing around $5 or less. Four-function calculators usually have a +, -, x and / sign to denote the operations and can produce decimal numbers. Some also have a % button, which is used to calculate percentages.
