To solve the expression \( \frac{1}{8} \) ? \( \frac{2}{5} \), we need to convert both fractions to their decimal equivalents.
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For \( \frac{1}{8} \): \[ \frac{1}{8} = 0.125 \]
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For \( \frac{2}{5} \): \[ \frac{2}{5} = 0.4 \]
Now, we can compare the two decimal values:
- \( 0.125 \) (which is \( \frac{1}{8} \))
- \( 0.4 \) (which is \( \frac{2}{5} \))
Since \( 0.125 < 0.4 \), the correct sign to make the statement true would be \( < \).
So, the complete statement would be: \[ \frac{1}{8} < \frac{2}{5} \]
Therefore, the answer is \( < \).