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
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.
3 x 5 x 7 = 105