1. Release thousands
8 - 3 = 5; drop 5.
5 visual steps / visible-place subtraction
8 - 3 = 5; drop 5.
6 - 2 = 4; drop 4.
4 - 1 = 3; drop 3.
2 - 1 = 1; drop 1.
Read 5 | 4 | 3 | 1 as 5431; borrow is gone.
A few quick rounds make each dropped digit feel light; borrow is the only thing to keep.
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