Are you using Google only for search websites or images? There are lots of great stuffs available in Google search and one of them is to make simple calculations without openingup your calculator program.

How to make calculations in Google? (numbers are examples)

To ADD, just type in the Google search box 52134 + 515876 and enter, to SUBTRACT type 315456-215452, to MULTIPLY type 5452 * 21 and enter, to DIVIDE type 5452 / 22 and enter, to get PERCENTAGE type 50% of 25

Interesting info on Google Calculator
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