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A fraction is a rational number that can be converted into a decimal or vice versa
Rational numbers are numbers that have a definite end. 33% can be converted into the decimal 0.33. This has a definite end so it is a rational number.
All rational numbers including integers can be be expressed as fractions whereas irrational numbers can't be converted into fractions
All of them are terminating and so all can be converted to rational numbers.
'3' is RATIONAL. All numbers are RATIONAL except those were the decimal goes to infinity AND the decimal digits are NOT in any regular order. pi = 3.1419592.... is probably the most well known IRRATIONAL number. Also the Square Roots of Prime numbers. NB 3.333.... recurring to infinity is RATIONAL, because it can be converted to a RATIO/Fraction.