Solutions by everydaycalculation.com
1st number: 7 0/9, 2nd number: 3 3/9
639 + 309 is 313.
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Related: 63/9+60/9 63/18+30/9 63/9+30/18 63/9+90/9 63/27+30/9 63/9+30/27 63/45+30/9 63/9+30/45 63/9+30/63
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