Q: Is 3.98 a rational number

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yes

It is: 300+80+18 = 398

Yes.

It must be a generalised rational number. Otherwise, if you select a rational number to multiply, then you will only prove it for that number.

yes

Related questions

It is an irrational number which can't be expressed as a fraction

398 is an integer and not a fraction. However, it can be expressed in rational form as 398/1. You can then calculate equivalent rational fractions if you multiply both, its numerator and denominator, by any non-zero integer.

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

yes

It is: 300+80+18 = 398

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.

398

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.