Q: What is the rational number for 0.21?

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As much as, in these days of uncertainty, anything can be anything. As long as the constraints of a rational number are kept to, a rational number will always remain a rational number.

Yes, but only if the rational number is 0.

Only if the rational number is 0.

Yes.

A rational number which is an integer can be simplified to a form in which the denominator is 1. That is not possible for a rational number which is not an integer.

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021-000-021

It is a rational number. It can be written as a fraction.

yes

Is 12.05 a rational number or irrational number?

1.96 is a rational number

It is a rational number, as it can be written as a fraction.

Yes, the sum is always rational.

There is no such thing as a number that is both rational and irrational. By definition, every number is either rational or irrational.

As much as, in these days of uncertainty, anything can be anything. As long as the constraints of a rational number are kept to, a rational number will always remain a rational number.

Yes, it is.

It is a rational number.

Since it can be written as a fraction (9.0 = 90/10), then it 9.0 is a rational number.