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I generally just multiply miles * 1.5 for a rough approximation.


Adding 10% of the original number to that is often easy as well, and makes the estimate very close to the correct conversion.


Works great for kg/lb conversions too.

kg x2 + 10% = lbs

lbs /2 - 10% = kg

I've yet to find a fast one for C to F temp conversions though. It takes a bit longer to do the 9/5-5/9 + or - equation in your head.


I remember watching some of them! Turner Classic Movies was the culprit and they were dreadful.

I suppose the technique has evolved exponentially since then.


Aw, man, yep, that was it. I vaguely recall the awful tinge of their movies. Looks like many actors, directors who were in some of the victimized movies were none too happy about the colorization: https://www.youtube.com/watch?v=ZKtRvBZx28c


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