Solutions by everydaycalculation.com
1st number: 3/10, 2nd number: 8 0/5
310 - 405 is -7710.
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Related: 6/10-40/5 3/10-80/5 3/20-40/5 3/10-40/10 9/10-40/5 3/30-40/5 3/10-40/15 15/10-40/5 3/50-40/5 3/10-40/25 21/10-40/5 3/70-40/5 3/10-40/35
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