3

Recursive math:
18
- 9
______

Comments
  • 1
    9????
  • 1
    -ve infinity if not stopped
  • 2
    @growling Written in the vertical you “can’t” subtract 9 from 8, so you “borrow” 10 from the tens place to make the 8 into 18. It’s an edge case of elementary math. Until Common Core made all the rules weird.
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