The smallest prime factor of 105 is 3.
42 prime factors -----> 2,3,7 105 prime factors -----> 3,5,7 There is 3 and 7 in common : There fore 3*7 = 21; 21 is the greatest common factor.
The second one.
7
Any multiple of 105.
105 35,3 7,5,3
105 35,3 7,5,3
The smallest prime factor of 105 is 3.
1 is not prime, so it can't be a prime factor.
105 35,3 7,5,3
3 x 5 x 7 = 105
The greatest common factor of 105 and 56 is 7.
It is: 3*5*7 = 105
106 53 2 is 53 prime? if so, there you go. if not, you continue.
105 35,3 7,5,3
3 x 5 x 7 = 105
To find the greatest common factor of two numbers, you first need to break those numbers down into their prime factors. For 105 and 147 this is: 105 = 3x5x7 147 = 3x7x7 The next step is to identify any common prime factors. In this case, both numbers have a 3 as a prime factor, and a 7 as a prime factor. Multiply these together to get the GCF: 3x7 = 21 Thus the greatest common factor of 105 and 147 is 21.