Solutions by everydaycalculation.com
1st number: 1 1/3, 2nd number: 6/21
43 + 621 is 3421.
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Related: 8/3+6/21 4/3+12/21 4/6+6/21 4/3+6/42 12/3+6/21 4/3+18/21 4/9+6/21 4/3+6/63 20/3+6/21 4/3+30/21 4/15+6/21 28/3+6/21 4/3+42/21 4/21+6/21
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