Solutions by everydaycalculation.com
1st number: 4 0/9, 2nd number: 7/9
369 + 79 is 439.
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Related: 72/9+7/9 36/9+14/9 36/18+7/9 36/9+7/18 36/9+21/9 36/27+7/9 36/9+7/27 36/9+35/9 36/45+7/9 36/9+7/45 36/9+49/9 36/63+7/9 36/9+7/63
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