Doing mathematical calculations have become easy with the help of a device known as a calculator.
A calculator is, essentially, an electronic device used for doing calculations. These days we have all kinds of calculators in the market. The ordinary calculators perform simple arithmetical operations. Addition, subtraction, multiplication and division are used for basic calculations. Human minds can err but nut calculators. Speed and accuracy are the watchwords of this small device.
A calculator looks like a small plastic box. The board contains numbers from 0 to 9 and + , -, ×, ÷ marks. The pushbuttons carrying these numbers and signs are pressed to do the required calculations. Besides simple calculators, there are also sophisticated calculators to perform more complex operations. There are scientific calculators also which can perform various scientific functions. Calculators are mostly operated by battery cells. Electrical and solar calculators are also available in the market.