13 means that the number can be rewritten as 13/1.
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If you mean in fraction, it is 13/40.
13, as a fraction in its simplest form, is 13/1
.13 or 0.13 as a fraction is 13/100
13 out of 50 can be expressed as the fraction 13/50.
If you mean 0.0325% then as a fraction it is 13/40000 simplified