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Here are some tips for Long Subtraction, which aligns with Florida state standards:

**Long Subtraction**

Long subtraction is nothing more than a series of simple subtraction
problems.

Simply subtract each column of numbers from the right to the
left. If the difference of any column would be less than 0, borrow 1
from the next column.

To succeed within the time limit, however, you must solve these
problems in your head.

If you try to write out the problems on a piece
of paper, you will probably run out of time.

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