I suspect that you meant 3½ × 3¼ as opposed to 3/12×3/14
To work with mixed numbers is is usually easier to convert them to improper fractions, do the calculation and convert any resulting improper fraction back to a mixed number
→ 3½ × 3¼ = (3×2+1)/2 × (3×4+1)/4
= 7/3 × 13/4
= (7×13)/(2×4)
= 91/8
= (11×8+3)/8
= 11 3/8
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