They can be simply: 7 and 14
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30 and 60
24 and 48
The LCM of 12 and 14 is 84. The LCM of a pair of numbers is their product divided by their GCF. The GCF of 12 and 14 can be no larger than their difference, which is 2. Since 2 goes evenly into 12 and 14, it is, in fact, the GCF. To find the LCM, then, multiple 12 and 14 and divide by 2 to get 84.
14 and 168 42 and 56
30 and 40