kahdeksankymmentä

Kahdeksankymmentä is a cardinal numeral in Finnish meaning eighty. It is formed by combining kahdeksan, meaning eight, with kymmentä, the form connected to ten, to express eight tens (8 × 10).

The word is used to express a precise quantity in counting, ages, measurements, and other numerical contexts. In everyday Finnish it appears in phrases such as kahdeksankymmentä vuotta or kahdeksankymmentä kappaletta, where the noun that follows is in the appropriate case or number. Common examples include Hän täyttää kahdeksankymmentä vuotta (He/she turns eighty) and Koulussa on kahdeksankymmentä oppilasta (There are eighty students in the school).

Spelling and grammar: kahdeksankymmentä is one word and behaves like other Finnish tens as a numeral modifying a noun. It declines along with the noun it modifies, so the exact form depends on case and number in the sentence. It is related to other tens forms such as kolmekymmentä (thirty), neljäkymmentä (forty), viisikymmentä (fifty), kuusikymmentä (sixty), seitsemänkymmentä (seventy), and yhdeksänkymmentä (ninety).

Origin and usage notes: kahdeksankymmentä reflects the traditional Finnish formation for multiples of ten, combining eight with ten. It is commonly used in informal and formal Finnish alike for precise round-number references, though in formal prose numbers are often written as numerals.