The question is ambiguous. If you mean 3 - 1/2, the answer is 2 1/2. If you mean -3 + 1/2, the answer is -2 1/2. If you mean 3 times 1/2, that is 1 1/2, but that doesn't seem to be what you have asked.
Answer 1
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1 1/2
1
12 and 1 half minus 3 and 5 6ths = 8 2/3
1 minus 1/2 minus 1/3 is equal to 0.166667
3 1/2
1/2 minus 1/8 is 3/8
1 minus a half is a half.
3 and 1/10
5/3 minus 1/2 is 1 1/6
1/3 minus 1/2 is -1/6
The answer is: 3/4 minus 1/2 = 1/4
1/2 minus 1/5 = 3/10
It is: 2 and 1/2 minus 1/6 = 7/3 or as 2 and 1/3