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3 x 3 x 5 = 45

2 x 2 x 3 x 5 = 60

3 x 5 = 15, the GCF

2 x 2 x 3 x 3 x 5 = 180, the LCM

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Q: What is the GCF and LCM of 45 and 60 using factor trees?
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To find the GCF and the LCM you have to first at least try to use prime factorization. So use factor trees. Or for the LCM find th least common multiples of the number.


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