Solutions by everydaycalculation.com
1st number: 1 2/3, 2nd number: 9/21
53 + 921 is 4421.
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Related: 10/3+9/21 5/3+18/21 5/6+9/21 5/3+9/42 15/3+9/21 5/3+27/21 5/9+9/21 5/3+9/63 25/3+9/21 5/3+45/21 5/15+9/21 35/3+9/21 5/3+63/21 5/21+9/21
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