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Whole Numbers
Subtraction

Always line up your numbers from the rear when subtracting.
Remember when you borrow the number that is too small will increase by 10.

Go over your work checking for any errors.

A scrap box should be used to do the calculations. Try not to get into the habit of doing your scrap work on another piece of paper. It is much easier to find a mistake if all the work is in front of you and located close to the problem.

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Are you still taking notes?

Remember you can repeat the movies as often as you need to.