The florist makes the greatest number of identical arrangements with the carnations and asters. She has 72 carnations and 42 asters. How can she decide how many carnations to place in each arrangement?

To make the greatest number of identical arrangements, find the greatest common factor of 72 and 42: it is 6, so she can make 6 arrangements. Divide the 72 carnations by 6 to find the number in each arrangement: 72 ÷ 6 = 12. Therefore, the correct choice is “Divide the number of carnations by the GCF of 72 and 42.”

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