The factors of one number are in the left circle, the factors of the other are in the right. The common factors are in the space in the middle where they intersect. The largest of these is the GCF.
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The universal set of a Venn diagram is the rectangle and everything that is inside it.
Put 2 and 10 in the left circle. Put 25 in the right circle. Put 1 and 5 in the space where they overlap. Since 5 is the greater of these two numbers, it is the GCF.
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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.
To create a Venn diagram showing the factors of 12 and 20, you would first list out all the factors of each number separately. The factors of 12 are 1, 2, 3, 4, 6, and 12, while the factors of 20 are 1, 2, 4, 5, 10, and 20. In the Venn diagram, you would place the factors of 12 in one circle and the factors of 20 in another circle, with the overlapping region representing the common factors, which in this case are 1, 2, and 4.