Solutions by everydaycalculation.com
1st number: 5/10, 2nd number: 4 0/10
510 - 4010 is -72.
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Related: 5/10-80/10 5/20-40/10 5/10-40/20 15/10-40/10 5/30-40/10 5/10-40/30 25/10-40/10 5/50-40/10 5/10-40/50 35/10-40/10 5/70-40/10 5/10-40/70
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