The best way to know is a fraction is irreducible is:
- Factorize both numerator and denominator.
- If there is no factor equal in numerator and denominator, the fraction is irreducible.
- If there is any factor equal in both numerator and denominator, just erase the same factor in both parts and you will find de irreducible fraction.
Another way to say this is that "numerator and denominator are mutual primes" (they don´t have any factor in common).
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