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

f-w1	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