The purpose is the toilet.
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"Coordinates" on a grid or graph are numbers that describe a location. There's no physical significance to the process of multiplying two locations, and the procedure is undefined.
Cartesian coordinates
You should find the answer on the ordnance survey website: http://www.ordnancesurvey.co.uk/oswebsite/gi/nationalgrid/nghelp1.html In essence the first two digits of X and Y correspond to a grid of alphabetical references, giving you the first two letters of the BNG. Hope this helps.
MGR4 (Map Grid Reference, 4) Four Grid Reference
Oh, dude, Paris is like the city of love, not some math problem. But if you really wanna know, the four-figure grid reference for Paris would be something like 48/2. But seriously, who needs coordinates when you can just follow the smell of fresh croissants and the sound of accordion music to find the Eiffel Tower?