SOLUTION: Is -4.2 a natural number, integer, rational number or an irrational number

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Question 900629: Is -4.2 a natural number, integer, rational number or an irrational number
Answer by jim_thompson5910(35256) About Me  (Show Source):
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-4.2 is NOT a natural number since it isn't a counting number (ie a positive whole number)

-4.2 is NOT an integer

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-4.2 = -(4+0.2) = -(4+2/10) = -(40/10 + 2/10) = -42/10 = -21/5

-4.2 = -21/5

This shows that -4.2 is a rational number. Since it is rational, it is NOT irrational.