To convert the mixed number \(3 \frac{6}{7}\) into an improper fraction, follow these steps:
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Multiply the whole number by the denominator of the fraction: \[ 3 \times 7 = 21 \]
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Add the result to the numerator: \[ 21 + 6 = 27 \]
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Place this sum over the original denominator: \[ \frac{27}{7} \]
Thus, the mixed number \(3 \frac{6}{7}\) converts to the improper fraction \(\frac{27}{7}\).