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When dealing with mixed numbers it is usually easier to work with improper fractions:

3 2/3 + 6 3/4 = (3×3+2)/3 + (6×4+3)/4

= 11/3 + 27/4

= (11×4)/(3×4) + (27×3)/(4×3)

= 44/12 + 81/12

= (44+81)/12

= 125/12

= (10×12+5)/12

= 10 5/12

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7y ago

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