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How borrowing works
1. Warm up
2. Borrow higher up
3. Two separate borrows
4. More borrows
5. Skip over a zero
6. Borrow across zeros
Example 1 — Warm up
One borrow
3
4
7
2
−
1
1
2
5
Let's try 3472 − 1125. Start on the ones. Can we take 5 away from 2?
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