Eye of Horus fractions were written as the sum of two or more unit fractions (a fraction with 1 as the numerator), with scribes possessing tables of answers (see Rhind Mathematical Papyrus 2/n table). Thus instead of , one would write + . Different parts of the Eye of Horus were thought to be used by the ancient Egyptians to represent one divided by the first six powers of two: The Rhind Mathematical Papyrus contains tables of "Horus Eye Fractions". Studies from the 1970s to this day in Egyptian mathematics have clearly shown this theory was fallacious and Jim Ritter definitely showed it
Horus name reaches back to the time of the Naqada II period at 3400 BC, and its development can be observed on objects from Naqada II to the 1st Dynasty. However, at the time of introduction, the serekhs of kings were yet anonymous. Later the name of the king was written beside the serekh or omitted completely. In many cases the serekh lacks the Horus falcon, and in other cases, such as the serekh of king Ka, the serekh seems to be held by Horus upside-down. During the middle and late Naqada III period (3200 - 3030 BC.), kings started to write