As a product of its prime factors: 2*3*13 = 78
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78
From 1 to 12 the numbers add to 78. If each of the 3 parts has to be equal then they must add up to 26 (a third of 78). I think the closest you will be able to get is 25, 26, 27.
Using division or multiplication or addition??
75, 76, 77, 78 and 79
Only in the ones column. Prime numbers aren't multiples of anything but one and themselves.