Put a check in each set the number belongs:
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81
I = Set of Irrational Numbers
Q = Set of Rational Numbers
Z = Set of Integers
W = Whole Numbers
I = Set of Irrational Numbers
81 is not an irrational number because it can be expressed as a square root - 9^2 = 81 - and is thus a rational number.
Q = Set of Rational Numbers
81 is a rational number because it can be expressed as a ratio of two integers: 81/1.
Z = Set of Integers
81 is an integer because it is a whole number.
W = Whole Numbers
81 is a whole number because it is a positive integer.