Solutions by everydaycalculation.com
1st number: 6 4/6, 2nd number: 13 3/6
406 - 816 is -416.
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Related: 80/6-81/6 40/12-81/6 40/6-81/12 40/18-81/6 40/6-81/18 40/30-81/6 40/6-81/30 40/42-81/6 40/6-81/42
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