To multiply the mixed numbers \( 3 \frac{1}{4} \) and \( 1 \frac{4}{9} \), we first convert them to improper fractions.
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Convert \( 3 \frac{1}{4} \): \[ 3 \frac{1}{4} = \frac{3 \times 4 + 1}{4} = \frac{12 + 1}{4} = \frac{13}{4} \]
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Convert \( 1 \frac{4}{9} \): \[ 1 \frac{4}{9} = \frac{1 \times 9 + 4}{9} = \frac{9 + 4}{9} = \frac{13}{9} \]
Now we multiply the two improper fractions:
\[ \frac{13}{4} \times \frac{13}{9} = \frac{13 \times 13}{4 \times 9} = \frac{169}{36} \]
Next, we can convert this back to a mixed number.
To do this, we divide \( 169 \) by \( 36 \):
- \( 169 \div 36 = 4 \) (since \( 4 \times 36 = 144 \))
- Remainder: \( 169 - 144 = 25 \)
Thus, in mixed number form:
\[ \frac{169}{36} = 4 \frac{25}{36} \]
So, the final answer is:
\[ 3 \frac{1}{4} \times 1 \frac{4}{9} = 4 \frac{25}{36} \]