Viisitoista

Viisitoista is the Finnish cardinal numeral for the number 15. It is part of the pattern used for numbers 11–19 in Finnish, formed by combining the unit five (viisi) with the suffix -toista. Examples of the teen numbers include yksitoista (11), kaksitoista (12), kolmetoista (13), neljätoista (14), and viisitoista (15). The pattern continues with kuusitoista (16), seitsemäntoista (17), kahdeksantoista (18), and yhdeksäntoista (19).

The numeral is used in ordinary counting as well as in phrases that express quantity, price, age, or time. For instance, viisitoista euroa means fifteen euros. When used to describe age, Finnish commonly forms compounds such as viisitoistavuotias, meaning “fifteen-year-old.”

In Finnish grammar, numerals such as viisitoista decline like adjectives when used with nouns, so their form can change to agree with case and number in a sentence. In practice, you will see viisitoista used in combination with nouns in various cases, and in expressions of quantity or age it often appears with the appropriate endings.

Spelling and usage notes: viisitoista is written as a single word. It functions as a standard cardinal numeral in Finnish and is part of the broader system of teen numbers that form a bridge between the units and the tens.