A calculator is a small, yet powerful device with the help of which we can calculate the numerical values of various mathematical expressions.
Calculators are small and convenient devices that we carry around in our pockets. They are perfect for those moments when we need to do some math but don't have a pen and paper handy.
Calculators come in a variety of shapes and sizes, from basic four-function tools to intelligent scientific calculators with graphing options that display calculations on the screen instead of just writing them down.
This online adding machine with a paper roll can store all your previous calculations on the paper roll for easy referencing.