Question 900629
-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.