'6' is RATIONAL.
Casually Irrational Numbers are those that have decimals going to infinity AND the decimal digits are NOT in any regular order.
'pi' = 3.141592.... is the most well known irrational number.
However, 3.3333... is RATIONAL becaause the decimal digits are in a regular order of '3'.
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10.01 is a rational number
No, 6 over 5 is not irrational. Irrational numbers cannot be expressed as a ratio of two integers. In this case, 6 over 5 simplifies to the rational number 1.2, which can be expressed as a ratio of 6 to 5.
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.