Solutions by everydaycalculation.com
1st number: 3/10, 2nd number: 4 2/10
310 - 4210 is -3910.
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Related: 6/10-42/10 3/10-84/10 3/20-42/10 3/10-42/20 9/10-42/10 3/30-42/10 3/10-42/30 15/10-42/10 3/50-42/10 3/10-42/50 21/10-42/10 3/70-42/10 3/10-42/70
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