Solutions by everydaycalculation.com
1st number: 5 1/3, 2nd number: 9/21
163 + 921 is 12121.
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Related: 32/3+9/21 16/3+18/21 16/6+9/21 16/3+9/42 48/3+9/21 16/3+27/21 16/9+9/21 16/3+9/63 80/3+9/21 16/3+45/21 16/15+9/21 16/3+63/21 16/21+9/21
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