12 is a rational number. Incidentally, there is no such time as 12 am or 12 pm: they are 12 noon and 12 midnight. Furthermore, if it was a time then it would not be a number (numbers do not have measurement units associated with them) and so it could not be rational.
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As,√144=√12×√12=12, which is an integer Therefore √144 is not irrational
It is irrational.
12 is the ratio of 12 and 1 ... nice and rational.
-12 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.