Solutions by everydaycalculation.com
1st number: 5 5/8, 2nd number: 3 3/8
458 + 278 is 91.
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Related: 90/8+27/8 45/8+54/8 45/16+27/8 45/8+27/16 45/8+81/8 45/24+27/8 45/8+27/24 45/40+27/8 45/8+27/40 45/56+27/8 45/8+27/56
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