Numbers from 1 to 10 have names that are used like other nouns (alternative colloquial forms in parentheses): ykkönen, kakkonen, kolmonen, nelonen (nelkku), viitonen (vitonen), kuutonen (kutonen), seitsikko (seiska), kahdeksikko (kasi), yhdeksikkö (ysi), kymppi. These names are somewhat irregular derivations of the basic numerals. For 7–9, there are also alternative, less common names: seitsemäinen, kahdeksainen, yhdeksäinen.
The words viitonen and kymppi are also used colloquially to refer coins or notes of five and ten euros or of other currency. For larger values, the following words may be used in speech: kakskymppinen (20), viiskymppinen (50), satanen (100), kakssatanen (200), viissatanen (500), tonni (1,000), kakstonninen (2,000), etc.
The names from ykkönen to yhdeksikkö are also used to refer to digits, such as the character “9”.
Names of numbers are also used for grades (e.g. at school, Sain kympin! means getting 10, the best grade), to numbered positions (e.g. Hän jäi kolmoseksi = kolmanneksi “He was only third”), and to things named with numbers (e.g., yhdeksikkö may refer to tram or bus number 9 or to card 9 in a playing card deck).