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That's already an integer.
50 can be expressed as the integer "fifty" or as the numerical value 50.
No, as it cannot be expressed as an integer or a quotient of an integer.
A rational number, other than an integer, is expressed as a fraction.
A rational number is one that can be expressed as one integer (whole number) over another integer. 4.89 = 489 ÷ 100 = 489/100 In this form 489 is an integer and 100 is an integer, so 4.89 can be expressed as one integer over another integer, thus it is a rational number.