5.1 is a rational number
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A rational number is one that can be expressed as the ratio of two integers. All integers (which includes 51) are themselves rational numbers as they can be written 51 = 51/1
no: the decimal is not repeating or terminating and therefore cannot be written as a fraction, which is one of the two requirements to be a rational number.
4.6 is rational.
No, it is rational.
0.38 is a rational number because it can be expressed as a fraction