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No, actually 2/5 is equal to .4 which is perfectly rational. Irrational Numbers have an infinitely long decimal expansion. This is just one digit.
Any rational number divided by any other rational number gives another rational number. Having an infinitely long decimal expansion is a necessary but not sufficient criterion for irrationality... for example, 1/3 is rational, though its decimal expansion is the infinitely long 0.33333333...
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Why is phi an irrational number?
phi = [1+sqrt(5)]/2 sqrt(5) is irrational and so phi is irrational.
Is the square root of 1 over 5 a real number and is it rational or irrational?
It is real and irrational.
Is 2 5 an irrational number?
No, 2/5 is a rational number because it can be expressed as a ratio of two integers. An irrational number cannot be expressed as a fraction.
What is an irrational number between 5 and 7?
4*sqrt(2) Rational multiples of irrational numbers are irrational. sqrt(2) is about 1.414, and 5/4 = 1.25 < 1.414... < 1.75 = 7/4 so 4*sqrt(2) is between 5 and 7, and is irrational.
Is 5 squared a irrational number?
5 squared is 5*5 is 25. 25 is not an irrational number.
