To perform the operation \( \frac{3}{10} \times \frac{3}{10} \), we can multiply the numerators and the denominators together.
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Multiply the numerators: \[ 3 \times 3 = 9 \]
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Multiply the denominators: \[ 10 \times 10 = 100 \]
Now we have: \[ \frac{9}{100} \]
Since \( 9 \) and \( 100 \) have no common factors (the greatest common divisor is 1), the fraction \( \frac{9}{100} \) is already in its simplest form.
Thus, the final answer is: \[ \frac{9}{100} \]