.126 = 126/1000 which can be reduced to 63/500.
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Rational numbers are numbers that can be written as a fraction. Irrational Numbers cannot be expressed as a fraction. Any number that is a fraction is not an integer, but rational.
6.6 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
All numbers that can be defined as a fraction are rational, so yes, 50 is rational. 50/1 is a fraction that represents 50.
5 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
If you mean 4/9 as a fraction then it is a rational number