Article: Believe it or not, there are many ways to fold a paper into thirds, but some give more precise results than others. Try this method if you don't need to be exact — it's quick and it works well, but rarely will your results be perfect.  On the plus side, you won't need any tools for this method. Note that a standard 8 1/2 × 11 inch sheet of paper doesn't have to be folded perfectly into thirds to fit in an envelope, making this a good choice for correspondence.
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Start with your paper flat on your work area.