Solutions by everydaycalculation.com
1st number: 4 0/3, 2nd number: 5/21
123 + 521 is 8921.
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Related: 24/3+5/21 12/3+10/21 12/6+5/21 12/3+5/42 36/3+5/21 12/3+15/21 12/9+5/21 12/3+5/63 60/3+5/21 12/3+25/21 12/15+5/21 84/3+5/21 12/3+35/21 12/21+5/21
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