Solutions by everydaycalculation.com
1st number: 2 2/3, 2nd number: 8/21
83 + 821 is 6421.
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Related: 16/3+8/21 8/3+16/21 8/6+8/21 8/3+8/42 24/3+8/21 8/3+24/21 8/9+8/21 8/3+8/63 40/3+8/21 8/3+40/21 8/15+8/21 56/3+8/21 8/3+56/21 8/21+8/21
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