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In order to add fractions you must have them over a common denominator.

The lowest common denominator in that case is twelfths.

Ok, now to convert...

1 1/4 = 1 3/12

1 1/3 = 1 4/12

now the addition is easy

1 3/12 + 1 4/12 = 2 7/12

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17y ago

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