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Do they have a common denominator? yes no What are the denominators? 12 = 1st step factor 1 12 8 = 8 1 The common prime factors are 2 * 2. The leftovers are: from 12 there is a 3. from 8 there is a 2. 12 = 2 x 2 x 3 8 = 2 x 2 x 2 The GCF or Greatest common Factor is 2 x 2 = 12 = 2 x 2 x 3 8 = 2 x 2 x 2 because the 12 & 8 share 2 times 2 = 4 12 = 2 x 2 x 3 8 = 2 x 2 x 2 because LCM = GCF x the leftovers LCM = 4 X 3 x 2 = 24 The LCM or Least Common Multiple is * * * * (left over from 8) (left over from 12) = = = = |