8 over 8 is 1 and so, in a question dealing with multiplication or division, it can be ignored since multiplication or division by 1 has no effect on the numbers.
So the question reducs to 12/8 which is 3/2 or 1.5
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Assuming twelve over eight means 12/8, 12 over 8 divided by 12 is one over eight, or 1/8.
3/8 divided by 7/12 = 0.64285714285
It is: 5/8 divided by 6/12 = 5/4 or 1.25
3/8 is the equivalent of 12/32
If you mean 3/8 divided by 7/12 then it is 9/12 in its lowest terms.