The GCF is 15.
The GCF for 15 30 45 is 15.The GCF is 15.It is: 15
GCF(30, 50) = 10.
The GCF of (-15) and 50 = 1
The GCF is 5.
The GCF is 10.
The GCF of 50 and 30 is 10. (I believe you meant to ask "What ?" instead of "Why ?".)
The GCF of 30, 50, 20 is 10.
The GCF is 15.
The greatest common factor (GCF) of 15, 30, 90 is 15.
The GCF is 15.
They are: gcf = 15 and LCM = 30