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
Four sons of Horus to say: "I have come to be your protection. I have bound your head and your limbs for you. I have smitten your enemies beneath you for you, and given you your head, eternally." Spell 148 in the Book of the Dead directly associates all four of Horus's sons, described as the four pillars of Shu and one of the four rudders of heaven, with the four cardinal points of the compass. Hapi was associated with the north. Imsety the human headed son of Horus, protected the liver of the deceased and was in turn protected by the goddess Isis.