Solutions by everydaycalculation.com
1st number: 3/10, 2nd number: 4 9/10
310 - 4910 is -235.
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Related: 6/10-49/10 3/10-98/10 3/20-49/10 3/10-49/20 9/10-49/10 3/30-49/10 3/10-49/30 15/10-49/10 3/50-49/10 3/10-49/50 21/10-49/10 3/70-49/10 3/10-49/70
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