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Not all paper has the same thickness or size, but if you are using the most usual type of paper, you can mail four sheets with one regular stamp.
Postage is determined by weight and by size. An envelope with three pieces of normal paper can normally be sent with one first class postage stamp. Additional stamps may be required based on additional ounces and on the size of the envelope.
500 sheets
Stamp has only one syllable
One ounce. That's four sheets of typing paper plus the envelope.Read more: What_is_the_most_a_letter_can_weigh_for_a_42_cent_stamp