Rachel
About
Khan Academy on a Stick
Alternate mental subtraction method
How I subtract in my head
Subtraction with borrowing (regrouping)
Subtraction 3: Introduction to Borrowing or Regrouping
Why borrowing works
Borrowing once example 1
Borrowing once example 2
Regrouping (borrowing) twice example
Alternate mental subtraction method
Level 4 Subtraction
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