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Express the numbers in prime factorisation in power form: 12 = 22 x 31 27 = 33 For gcf multiply together the lowest power of the common primes: gcf of 12 and 27 = 31 = 3 For LCM multiply together the highest power of all the primes (across the numbers): LCM of 12 and 27 = 22 x 33 = 108

The GCF of 27 and 81 is 27. And their LCM is 81.

27 and 54, respectively.

Also 18 and 27.

The GCF is 9. The LCM is 135.

The LCM is 270. The GCF is 3.

The GCF is 1. The LCM is their product.

The GCF is 27 and the LCM is 810.

3 and 675, respectively.

The LCM is: 1,323

27 and 81, respectively.

9 and 54 18 and 27

The LCM is 189.

3 and 54, respectively.

The LCM is 756.

The LCM is 216.

The LCM is 1188.

9 and 54 have a GCF of 9 and an LCM of 54. You could also use 18 and 27.

The LCM of 27, 6, and 12 is 108.

The LCM of the given two numbers is 27

2 x 2 x 3 = 12 3 x 3 x 3 = 27 The GCF is 3. The LCM is 2 x 2 x 3 x 3 x 3, or 108

LCM(6, 12, 27) = 108

The LCM of 12 and 27 is 108

LCM/GCF = 54/9 = 6 So you require two factors of 6 such that their maximum is the smallest. Therefore, rather than 1 and 6, you select 2 and 3. The two numbers are GCF*2 and GCF*3, that is 18 and 27.

GCF = 27 LCM = 81 81 is the LCM of 27 and 81