Since 20 is a factor of 60, it is automatically the GCF.
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The least common multiple of 12, 20 and 60 is 60. 60/12 = 5 60/20 = 3 60/60 = 1
prime
The GFC of the numbers 54, 72 and 96 is 6.
The LCM is: 120
The least common multiple of 3, 15, and 20 is 60.