The GCF of two prime numbers is 1.
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Prime factors of 210 are: 2, 3, 5 and 7 Prime factors of 385 are: 5,7 and 11 Common factors are: 5 and 7 and so 5*7 = 35 which is the hcf
Prime factorization is one of the ways you find the HCF.
The numbers are relatively prime or co-prime.
The GCF is 2.
2