RATIONAL.
Any DEcimal Number that can be made into a fraction/ratio is RATIONAL.
So 0.3333..... is Rational as its fraction is '1/3'
BUT
pi = 3.141592.... is IRRATIONAL because in casual terms the decimal digits are NOT in any regular order.
As a rough rule, All numbers are rational except. ;-
pi , 'e' and the square roots of prime numbers.
NB There are other Irrational Numbers too!!!!!
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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.
-Pi is irrational, because it does not terminate or repeat. Whenever you multiply an irrational number by a rational number (-1), the result is an irrational number.
Any irrational number, added to 0.4 will give an irrational number.