Subtraction with regrouping worksheets and online exercises 3-Digit Subtraction 100to10 or 10to1 regrouping. Grade/level: Grade 2. by dibberdabber. Subtract 2 digits whole numbers with regrouping. Grade/level: elementary. by cynthiasmith. Subtract 3 digits with regrouping 5. Grade/level: 4. by cynthiasmith.