0.91 m is approximately 3 feet
3 feet = 0.9144 m (exactly)
(Though why you don't use the more sensible 1 yard, especially for short distances to intersections when driving, is beyond me.)
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yes it is customary
Yards :)
In the SI system (metric), length is a meter, mass is the kilogram, and time is the second.
I guess it is putting a number in standard form
50 centimeters is about half of a meter or a little over 1.5 feet because in us customary 1.5 feet is 0.4572 meters which is just a little under half of a meter.