Are you having difficulties performing subtraction? Maybe you're just having trouble with the constant switching between borrowing and actually subtracting as thought traditionally in school. Why have they never taught us to do all the borrowing first so that all the actual subtraction is done in one fell swoop? In this video at KhanAcademy.org, Sal teaches a different approach and much more intuitive method to subtraction.
Full video:
Subtraction: Do all your borrowings first!
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