Solutions by everydaycalculation.com
1st number: 16 0/4, 2nd number: 1/8
644 - 18 is 1278.
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Related: 64/4-2/8 64/8-1/8 64/4-1/16 64/4-3/8 64/12-1/8 64/4-1/24 64/4-5/8 64/20-1/8 64/4-1/40 64/4-7/8 64/28-1/8 64/4-1/56
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