Draw a Venn diagram. Let circle 1 be the factors of 30, circle 2 be the factors of 40 and circle 3 be the factors of 48. Put the numbers 5 and 10 in the space where 1 and 2 intersect. Put the numbers 4 and 8 in the space where 2 and 3 intersect. Put the numbers 3 and 6 in the space where 1 and 3 intersect. Put the numbers 1 and 2 in the space where all three intersect. That leaves 15 and 30 in Circle 1, 20 and 40 in circle 2 and 12, 16, 24, 48 in circle 3. The GCF is 2.
The GCF is 30.
The GCF is 30.
The GCF is: 1
The GCF is 5.
The GCF is 3.
The GCF is 1.
The GCF is 1.
The GCF is 6.
The GCF is 2.
The GCF is 10.
The GCF is 6.
The GCF is 6.