Solutions by everydaycalculation.com
1st number: 10 0/4, 2nd number: 5/12
404 + 512 is 12512.
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Related: 80/4+5/12 40/4+10/12 40/8+5/12 40/4+5/24 40/4+15/12 40/12+5/12 40/4+5/36 40/4+25/12 40/20+5/12 40/4+5/60 40/4+35/12 40/28+5/12 40/4+5/84
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