To convert 1/2% (0.5%) to a decimal divide, by 100: 0.5% ÷ 100 = 0.005
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11/2% = 0.015
1/2% = 0.0050
1/2, one half, .5, or .5%
We write .5 or 0.5 as the decimal for one half.
One half percent can be written in decimal as 0.005 or just .005