Solutions by everydaycalculation.com
1st number: 13 1/3, 2nd number: 8/9
403 + 89 is 1289.
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Related: 80/3+8/9 40/3+16/9 40/6+8/9 40/3+8/18 40/3+24/9 40/9+8/9 40/3+8/27 40/3+40/9 40/15+8/9 40/3+8/45 40/3+56/9 40/21+8/9 40/3+8/63
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