>  All for the sake of saving a "by 10"...

Language, especially spoken, works like that a lot - things are dropped when 
they are not needed.  Another common thing is to drop the units entirely if 
they are not necessary, this happens *a lot*.  Sometimes units are even 
shortened to scientifically incorrect ones (eg I have heard "a speed limit 
of 60 miles") but the point is that everyone understands what is meant, when 
you are talking to friends casually you are not at a scientific conference - 
and you'll likely be labeled as a jerk if you start saying things like "you 
mean miles *per hour*?" in the conversation.

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