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Yes. Any whole number is rational. An irrational number is one that goes on forever without repeating, like √2=1.414213...
What else can I help you with?
Is 21 a rational or irrational number?
21 is a rational number.
Is the square root of 21 rational?
No, they are not.
Is 21 out of 71 rational or irrational?
21/71 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
Is 8 out of 21 rational?
no it is not
Is 21 over 3 a rational or irrational number?
21/3 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
Is 21 over the square root of 4 a rational or irrational?
It is equal to 21/2 which is a rational number
Is 4.2 an irrational or rational number?
It is rational because it can be expressed as a fraction which is 21/5
Why is 8 out of 21 not rational?
Because it can be expressed as a fraction in the form of 8/21
Is 0.21 rational or irrational?
0.21 is a rational number because it can be expressed as a fraction in the form of 21/100
Is the square root of 441 a rational number?
Yes because 21 is a rational number
Why is 0.21 a rational number?
0.21 is a rational number because it can be expressed as a fraction in the form of 21/100
Is 2.1 rational?
Yes. It's the ratio of 21 to 10.
