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=== Notation ===
To write the unit fractions used in their Egyptian fraction notation, in hieroglyph script, the Egyptians placed the [[Egyptian hieroglyphs|hieroglyph]]:
{{center|<hiero>D21</hiero>}}
(''er'', "<nowiki>[one]</nowiki> among" or possibly ''re'', mouth) above a number to represent the [[Multiplicative inverse|reciprocal]] of that number. Similarly in hieratic script they drew a line over the letter representing the number. For example:
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