A rational number is a real number which can be expressed as a division of two integers. A real number which is not rational is called irrational.
Since 3.14 = 314/100 and 314 & 100 are integers it is a rational number.
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No number can be rational and irrational at the same time. 3.14 is the ratio of 314:100 and so is rational. HOWEVER, 3.14 is also a common approximation for pi, which is an irrational number. All irrational numbers have infinite, non-recurring decimals and so are often approximated by rationals.
No. It can be written as a fraction where the denominator is not 0. For example, 314/100. This makes it rational.
The sum of a rational and irrational number must be an irrational number.
rational * irrational = irrational.
No, 3.56 is not an irrational number. 3.56 is rational.