That is not what mathematicians mean by an irrational number, which is a number with an infinitely long decimal expansion. You will note that since division is the inverse of multiplication, dividing by small numbers has the same effect as multiplying by large numbers, and so dividing by zero, which is an infinitely small number, is equivalent to multiplying by infinity. The result in most cases is deemed to have no mathematical meaning.
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At least one of the factors has to be irrational.* An irrational number times ANY number (except zero) is irrational. * The product of two irrational numbers can be either rational or irrational.
Any rational number (by definition).
Rational number can be divided into more that the number 2. Irrational number are numbers that can only be divided evenly with the number 2.
The same as you would a rational number. Its distance from zero will represent the number, whether it is rational or irrational.
0.2857