The greatest number among the fractions \( \frac{1}{5}, \frac{1}{4}, \frac{1}{11}, \frac{1}{13} \) is:
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When numerators are equal, look directly for the smallest denominator to find the largest fraction. Think of it practically: sharing a single pizza among 4 people gives each person a larger slice than sharing it among 5, 11, or 13 people!