1, 2, 3, 4, 6 and 12
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It is: 12
The GCF is: 12
Multiple is just a number greater than or equal to the number that the number goes into (confusing so let's look below). Multiples: 12: 12, 24, 36, 48, 60, 72, 84, 96 7: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84 So the LCM of 12 and 7 is 84.
84 is the mass number: 36 proton plus 48 neutrons