I used a factor tree. 165 55,3 11,5,3
3 is the smallest prime factor of 165.
165 55,3 11,5,3
It's a prime factor.
No, 144 and 165 are not relatively prime. For them to be relatively prime, the number 1 could be their only common factor, but they also have 3 as a common factor.
The greatest common factor of 165 and 180 is 5. The prime factorization of 165 is 11*3*5. The prime factors of 180 are 2*2*5*9.
3 x 5 x 11
the greatest com man factor is 33
2 x 5 x 13 = 130 3 x 5 x 11 = 165 The common prime factor is 5.
You might look for some obvious factor first. In this case, since it ends with 5, it is divisible by 5. Divide 165 / 5 to get the other factor. Then see whether this other factor can be divided into smaller factors. Try small factors (2, 3, 5, 7) first.
Find the HCF of 135 and 165 prime factor method
The two numbers are co-prime so their GCF is 1.