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BOBBY Permalink
August 25, 2011, 14:42

Miles to KM
A nice mental method for multiplying by 1.6 is to double the number 4 times then divide by 10.

e.g. 25 miles -> 50, 100, 200, 400, 40km

27miles-> 54, 108, 216, 432, 43.2 km

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