þversumma

Icelandic

Etymology

From þver- (“cross-, intersecting”) +‎ summa (“sum”).

Examples
The digit sum of 1981 is 1 + 9 + 8 + 1 = 19

Noun

þversumma f (genitive singular þversummu, nominative plural þversummur)

1. (mathematics) a digit sum, a transverse sum; (the sum of all the digits of an integer)

Declension

Declension of þversumma (feminine, based on summa)

	singular		plural
	indefinite	definite	indefinite	definite
nominative	þversumma	þversumman	þversummur	þversummurnar
accusative	þversummu	þversummuna	þversummur	þversummurnar
dative	þversummu	þversummunni	þversummum	þversummunum
genitive	þversummu	þversummunnar	þversumma	þversummanna