Solutions by everydaycalculation.com
1st number: 2 0/3, 2nd number: 5/21
63 + 521 is 4721.
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Related: 12/3+5/21 6/3+10/21 6/3+5/42 18/3+5/21 6/3+15/21 6/9+5/21 6/3+5/63 30/3+5/21 6/3+25/21 6/15+5/21 42/3+5/21 6/3+35/21 6/21+5/21
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