Its 15 because 30's factors are 3 and 10 and 10's factors are 2 and 5.With 75 it's factors are 5 and 15 and 15's factors are 3 and 5 so if you make a prime factorization tree the greatest common factor is 15
The GCF is 15.
The GCF is 3.
The GCF is 1.
25
The GCF is 3.
The GCF is 75
150
Since 25 is a factor of 75, it is automatically the GCF.
Any multiple of 150.
The GCF is 30.
The GCF is 30.
The GCF is: 1