Solutions by everydaycalculation.com
13 - 312 is 112.
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Related: 2/3-3/12 1/3-6/12 1/6-3/12 1/3-3/24 1/3-9/12 1/9-3/12 1/3-3/36 5/3-3/12 1/3-15/12 1/15-3/12 1/3-3/60 7/3-3/12 1/3-21/12 1/21-3/12 1/3-3/84
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