Question

13- 12 11/12
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Answer 1

$13-12\frac{11}{12}=(13-12)-\frac{11}{12}=1-\frac{11}{12} =\frac{1}{12}$

Answer 2

$\displaystyle13 - 12 \frac{11}{12} = 13 - \frac{155}{12} = \frac{156 - 155}{12} = \frac{1}{12} .$