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A rational number is one that can be written as a fraction, with whole numbers for numerator and denominator; for example 1/2, 3/5, 7/3, and any whole number (for example, 7 = 7/1).
An irrational number is one that can not be written in such a way, for example the square root of any number except a perfect square (square root of 2, of 3, of 5, etc.), pi, e, etc.
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Is 21 over the square root of 4 a rational or irrational?
It is equal to 21/2 which is a rational number
Is 3.9 rational or irrational?
If there are no numbers after the 9 it is rational
Is 27 Rational or irrational?
2.7 is rational. Rational numbers are numbers that can be written as a fraction. Irrational Numbers cannot be expressed as a fraction.
Is 21.192 rational or irrational?
21.192 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
Is 1.777. rational or irrational and why?
1.777...(repeating) is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
