Solutions by everydaycalculation.com
1st number: 1/3, 2nd number: 1 1/7
13 + 87 is 3121.
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Related: 2/3+8/7 1/3+16/7 1/6+8/7 1/3+8/14 1/3+24/7 1/9+8/7 1/3+8/21 5/3+8/7 1/3+40/7 1/15+8/7 1/3+8/35 7/3+8/7 1/3+56/7 1/21+8/7 1/3+8/49
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