When working with mixed numbers, it is usually easier to convert them to improper fractions, do the operations, and then to convert any resulting improper fraction back to a mixed number:
4 1/3 + 3 3/4 = (4×3+1)/3 + (3×4+3)/4
= 13/3 + 15/4
= (13×4)/(3×4) + (15×3)/(4×3)
= 52/12 + 45/52
= 97/12
= (8×12+1)/12
= 8 1/12
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