HOW TO USE WEB BROWSER AS CALCULATOR ???

Follow these steps:

1) First open your web browser console.

Crome : Press CTRL + SHIFT + J to open console in chrome.
           
 Just type calculation and press enter to get result.

Firefox : Press CTRL + SHIFT + J to open console in firefox.
           
 Just type calculation and press enter to get result.

Opera :  Press CTRL + SHIFT + I to open console in firefox.
           
 Just type calculation and press enter to get result.

 Enjoy..:)