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-12 12
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The numerical value of negative twelve is -12. In mathematics, the negative sign indicates a number is less than zero. In this case, the number twelve is being multiplied by negative one, resulting in a value of negative twelve.
Positive nine, or plus eighteen.
Negative in English terms means "opposite." Multiplication can represent "of". So, negative times negative is the "opposite of the opposite." And the opposite of an opposite is the same, hence positive, because "same" is the opposite of "opposite" and positive is the opposite of negative. So if you put it into English words, it actually makes some sense. In essence, negative and negative "cancel out."
-12.012
-12 (negative twelve)