Solutions by everydaycalculation.com
1st number: 3 0/9, 2nd number: 4 4/9
279 + 409 is 679.
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Related: 54/9+40/9 27/9+80/9 27/18+40/9 27/9+40/18 81/9+40/9 27/9+40/27 27/45+40/9 27/9+40/45 27/63+40/9 27/9+40/63
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