Google’s calculator results has just got a major upgrade to the answers provided and the user interface. Now when you search Google for a math answer, Google will not only show you the answer but also give you a new interface for the answer, including a full size 34-button scientific calculator.
Here is a screen shot:
So not only do you get the answer quickly, you can now make additional calculations on the virtual scientific calculator.
In addition, when you search for conversion related queries, such as [100 feet to inches] Google will give you a new user interface for that as well:
Google also has a 3D animated graphical calculator since March of this year.