>>Not temperature, numbers. Listen to students talking math. I haven't heard them say "minus 10", only "negative 10".
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>Are you sure you are still in the U.S.? :o)
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>For: -10 degrees F
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>"Ten below zero"
>"Minus 10 [degrees]"
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>are the most common when referring to temperature. Seldom do you say or hear "Negative 10 degrees" although I have heard it stated that way every now and then -- unless you are referring to the operation itself. In Math, it is more common to refer to negative numbers as "negative 10" and the operation as "minus" e.g. -10 - (-1) "Negative 10 minus negative one" or -3 - (-6) = "Negative 3 minus negative 6"...
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>When referring to the point on the scale, I've heard "negative 10" and "minus 10" from kids

This proves I'm in the US. There isn't even a consistent way of reading numbers - it's decided on a case by case basis! If it's a temperature and negative, read it like this, if it's maths and negative, read like that, if it's accounting and negative read as positive and say "debit"... There's no system, so here I am :).