Solutions by everydaycalculation.com
1st number: 6 4/6, 2nd number: 6 4/6
406 + 406 is 403.
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Related: 80/6+40/6 40/6+80/6 40/12+40/6 40/6+40/12 40/18+40/6 40/6+40/18 40/30+40/6 40/6+40/30 40/42+40/6 40/6+40/42
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