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0.39 is a rational number. A rational number is any number that can be expressed as a fraction where the numerator and denominator are integers, and the denominator is not zero. In this case, 0.39 can be expressed as 39/100, which meets the criteria for a rational number.
Well, honey, let me break it down for you. 0.39 is a rational number because it can be written as a fraction, in this case 39/100. So, it's not some wild and irrational number running around causing chaos - it's just a nice, orderly rational number.
10.01 is a rational number
Rational
Such a product is always irrational - unless the rational number happens to be zero.
The sum of a rational and irrational number must be an irrational number.
rational * irrational = irrational.