Khan Academy Subtraction with borrowing (regrouping) 524 05:09
Khan Academy Subtraction with borrowing (regrouping) 512 05:05
Khan Academy Subtraction with borrowing (regrouping) 523 04:27
Khan Academy Subtraction with borrowing (regrouping) 508 03:44
Khan Academy Subtraction with borrowing (regrouping) 569 02:23
Khan Academy Subtraction with borrowing (regrouping) 509 03:47
Khan Academy Subtraction with borrowing (regrouping) 531 03:19
Khan Academy Subtraction with borrowing (regrouping) 533 02:46