4333 - 3334 = 999 is correct but need to keep 4 digits so write 0999 then you get: 9990-0999=8991 and so on.

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## you need to keep it 4 digits

4333 - 3334 = 999 is correct but need to keep 4 digits so write 0999

then you get:

9990-0999=8991 and so on.