There is no such thing as "closest".
If you name a fraction, then no matter how small it is, I can always name one
that's smaller ... all I have to do is make the denominator bigger than yours,
and my fraction is closer to zero than yours is.
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Zero can be neither the numerator nor the denominator of a fraction.
zero.
any fraction
The answer depends on the part of the question that is missing.
No. The reason you can multiply a fraction by (x/x) to find an equivalent fraction is because for almost any x, (x/x) = 1. This is not the case for zero. Zero divided by zero does NOT equal 1, so multiplying the fraction by a value not equal to 1 will create a different fraction.