Solutions by everydaycalculation.com
1st number: 1 2/3, 2nd number: 8/21
53 + 821 is 4321.
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Related: 10/3+8/21 5/3+16/21 5/6+8/21 5/3+8/42 15/3+8/21 5/3+24/21 5/9+8/21 5/3+8/63 25/3+8/21 5/3+40/21 5/15+8/21 35/3+8/21 5/3+56/21 5/21+8/21
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