Solutions by everydaycalculation.com
1st number: 10/40, 2nd number: 1 2/10
1040 - 1210 is -1920.
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Related: 20/40-12/10 10/40-24/10 10/80-12/10 10/40-12/20 30/40-12/10 10/40-36/10 10/40-12/30 50/40-12/10 10/40-60/10 10/40-12/50 70/40-12/10 10/40-84/10 10/40-12/70
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