To identify the missing denominator in the subtraction expression \( \frac{3}{5} - \frac{1}{?} \), we need to find a common denominator for the fractions.
The expression contains \( \frac{3}{5} \) and \( \frac{1}{?} \). Since the first fraction has a denominator of 5, we can set the second denominator (let's call it \( x \)) to be the same.
To find the missing denominator, we can set up an equation where we find a value for \( x \) such that the fractions can be subtracted easily. Assume we want the two fractions to have a common denominator:
\[ x = 5 \]
This means that the expression becomes:
\[ \frac{3}{5} - \frac{1}{5} \]
This allows us to easily subtract the two fractions:
\[ \frac{3 - 1}{5} = \frac{2}{5} \]
Thus, the missing denominator is:
\[ \boxed{5} \]
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