1 over 18 cannot be reduced. It cannot be reduced because if the numerator is 1 then that's the lowest you can go.
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6 over 18 is reduced to 1/3
2/18 reduces to 1/9
No, the Greatest Common Factor (GCF) of 5 and 18 is 1, so the fraction 5/18 can't be reduced.
It is: 4/18 = 2/9 reduced
72 over 100 can be reduced to 18 over 25.