Solutions by everydaycalculation.com
1st number: 4 0/3, 2nd number: 5/12
123 + 512 is 5312.
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Related: 24/3+5/12 12/3+10/12 12/6+5/12 12/3+5/24 36/3+5/12 12/3+15/12 12/9+5/12 12/3+5/36 60/3+5/12 12/3+25/12 12/15+5/12 12/3+5/60 84/3+5/12 12/3+35/12 12/21+5/12 12/3+5/84
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