Solutions by everydaycalculation.com
1st number: 4 2/3, 2nd number: 6/21
143 + 621 is 10421.
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Related: 28/3+6/21 14/3+12/21 14/6+6/21 14/3+6/42 42/3+6/21 14/3+18/21 14/9+6/21 14/3+6/63 70/3+6/21 14/3+30/21 14/15+6/21 98/3+6/21 14/3+42/21 14/21+6/21
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