Two popular methods for subtracting large numbers are covered here - Borrow & Payback and Decomposition (both are known by other names).
Which method you were taught often depends on when you went to school. This video looks at both methods and compares the two.
0:35 Borrow & Payback
Music: Ben Thomas, used with permission.
Video excerpt from A Fish Called Wanda (1988)
Audio excerpt from The Goonies (1985)
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