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.