If by "fraction", you mean a number, it already is a fraction.
If by "fraction" you mean a "numerator-over-denominator" numeral, 0.4 has the same value as the 4/10 numeral and anything equivalent to that.
It is enough to know that the value of the first place to the right of the decimal point is tenths (or "dimes") .... and the next place to the right has place-value as hundredths (or "cents") ... so that 0.47 means 4dimes+7cents ~ 47cents.
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The answer depends on what you want to convert to a fraction and a fraction of what other quantity.
The answer depends on what you wish to convert into a mixed fraction.