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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.

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Q: How is 4.89 a rational number?
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