Step-by-step explanation:
GCF: greatest common factor of any two (or more) numbers
Top left:
GCF of 4, 10, 14: 2
Top right:
GCF of 14, 35, 84: 7
Bottom left:
GCF of 9, 18, 42: 3
Right left:
GCF of 8, 32: 8
