Solutions by everydaycalculation.com
812 - 312 is 512.
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Related: 16/12-3/12 8/12-6/12 8/24-3/12 8/12-3/24 24/12-3/12 8/12-9/12 8/36-3/12 8/12-3/36 40/12-3/12 8/12-15/12 8/60-3/12 8/12-3/60 56/12-3/12 8/12-21/12 8/84-3/12 8/12-3/84
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