top | item 47068394 (no title) kevinh | 11 days ago Seems like it's only when adding 1 + 4, 6, or 8 in a place value or where one of them is 0. It doesn't seem like it'd ever hold across a carry, but I could be missing something.Edit: There's actually a few cases with adding 2 as well! discuss order hn newest No comments yet.
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