Solutions by everydaycalculation.com
1st number: 3 0/9, 2nd number: 4 6/9
279 + 429 is 233.
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Related: 54/9+42/9 27/9+84/9 27/18+42/9 27/9+42/18 81/9+42/9 27/9+42/27 27/45+42/9 27/9+42/45 27/63+42/9 27/9+42/63
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