Worked example: Subtracting 3-digit numbers (regrouping twice)
imp-addition-and-subtraction--imp-subtracting-with-regrouping-within-1000--regrouping-twice-when-subtracting-three-digit-numbers
Addition, subtraction, and estimation
Subtracting with regrouping within 1000
Sal using regrouping (borrowing) to subtract 913-286.