No, 12 and 18 are not coprime. Their common factors are 2, 3, and 6.
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Numbers that are co-prime have no factors in common. Because 6 is a common factor of both 12 and 18, they are not co-prime, or prime to each other.
They are coprime so only 1 does.
No 5 is a prime number and 12 is composite number
Only the 1 times table. 12 and 55 are coprime.
The fraction is 12/125. The two numbers are coprime and so the fraction cannot be simplified.
18 factors to [2 3 3] 34 factors to [2 17] They have a common factor of 2, so they are not coprime.