1/2 as a decimal is 0.5, or just .5, but there is no difference between the two.
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1 over 2 = 0.5 as a decimal and 50% as a percent
It is: 4/2 = 2/1 = 2.0 as a decimal but 2/4 = 1/2 = 0.5 as a decimal
2 and 1/8 as a decimal is 2.125
It is: 1/2 = 0.5
As a rational fraction it is 1/2.As a decimal fraction it is 0.5