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81 is rational. Rational numbers are numbers that can be written as a fraction. Irrational Numbers cannot be expressed as a fraction.
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Earn +20 ptsQ: Is 9 squared rational or irrational?
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Continue Learning about Algebra
Is 28 squared rational or irrational?
28 squared is 784 which is a rational number
Is 4 over 9 squared rational or irrational?
Any number that can be written as a fraction is rational -- therefore, 4/9 squared is rational (it can still be written as a fraction even if you multiply it by itself).
Is 20 rational or irrational?
20 squared is 400 which is a rational number
Is pi squared rational?
No because pi still remains as an irrational when squared.
IS 0.4 squared an irrational number?
The square of any rational number is also rational.
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