SOLUTION: to which subset of the real numbers does -18 not belong?

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Question 653299: to which subset of the real numbers does -18 not belong?
Found 2 solutions by Shana-D77, stanbon:
Answer by Shana-D77(132) About Me  (Show Source):
You can put this solution on YOUR website!
There is a great Venn diagram (not usuall a fan of the Venn, but in this one case, I am) here:
http://thinkzone.wlonk.com/Numbers/NumberSets.htm
You can see that because -18 is negative, it is not a Natural (counting) number.

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Rational and Integers
Cheers,
Stan H.