It is: 12 and 1/5 = 12.5
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0.125
One and a half is twelve eights.plus five eights, is seventeen eights. That is two and one eighth in total, or 2.125 in decimal.
Twelve half pounds is six pounds . One sixth of that is one pound.
We write .5 or 0.5 as the decimal for one half.
12 and one half as a decimal is 12.5