Solutions by everydaycalculation.com
1st number: 2 0/3, 2nd number: 4/21
63 + 421 is 4621.
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Related: 12/3+4/21 6/3+8/21 6/3+4/42 18/3+4/21 6/3+12/21 6/9+4/21 6/3+4/63 30/3+4/21 6/3+20/21 6/15+4/21 42/3+4/21 6/3+28/21 6/21+4/21
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