Solutions by everydaycalculation.com
1st number: 4 0/8, 2nd number: 7/8
328 + 78 is 398.
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Related: 64/8+7/8 32/8+14/8 32/16+7/8 32/8+7/16 96/8+7/8 32/8+21/8 32/24+7/8 32/8+7/24 32/8+35/8 32/40+7/8 32/8+7/40 32/8+49/8 32/56+7/8 32/8+7/56
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