"Han" wrote in message
...
"Ed Pawlowski" wrote in
:

As mentioned, it is all what you are used to. As a born Hllander who
came to the US in '69 at 25 yoa, I should tell you that getting used to
inches and feet is not that easy at first, and I still have trouble with
the farting fractions of an inch.

I am sure you are right. But respectfully I ask, if you have trouble with
fractions of an inch, did you study fractions at all when growing up?
Absolutely no disrespect is intended with that question.
In the US we are taught fractions early in school, that may be why we prefer
fractions of a measurement rather than a whole number portion of a
measurement.


snip


Nevertheless, miles, feet, inches come pretty natural to me now, as do
meters, centimeters and nanometers. To interchange them, I need a
calculator calibrated to about 2.54 (cm/inch).

In the times that I use metric and inches I just "round" 25 mm to the inch,
4" ~ 100mm.
1/2 inch ~ 12.5 mm or 6 1/2 mm
1/4 inch ~ 6.25mm or 6 1/4 mm
1/8 inch ~ 3.125mm or 3 1/8 mm