A nanometer is a unit of measurement in its own right. 1 nm = 1 nm so, as a fraction of a nm, it is 1. As a fraction of a picometre it is 1000 and as a fraction of a kilometre it is a quadrillionth.
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one billionth
Every fraction is an equivalent fraction: each fraction in decimal form has an equivalent rational fraction as well as an equivalent percentage fraction.
A fraction that has a different sign to the first fraction.
Divide the fraction by 100, and you will get the percentage of a fraction.
Or both. That's a complex fraction.