As a decimal: 7 and 1/2 = 7.5
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It already is in its simplest form. In decimal, it is 7.5
0.0075
3.5 or 7/2 or 3 and 1/2 Seven halved is three and a half; three and a half times two equals seven.
We write .5 or 0.5 as the decimal for one half.
12 and one half as a decimal is 12.5