Every time when we need to solve a specific math problem and want to make sure that we have the right answer, a calculator can come in really handy. Calculators are mini, portable computers that can perform a multiple range of complex calculations and can solve various types of equations and problems.

While there are more complicated calculators available like the scientific calculator, the basic models perform the simplest of four functions. They most certainly help us solve almost all of our everyday math problems.

So, a four-function calculator ideally performs the four most basic operations of all time. It performs activities like addition, subtraction, multiplication and division.

Now, depending on the complexity of the given operation in the question, a four-function calculator can sometimes be limiting. Since it might not be able to display more than a certain number of digits on its display screen, it can be limited in terms of the size of numbers it can add (which is hence restricted).