ok

Two letters, and it does everything. Add -a for the ordinal oka, eighth, which is also how you tell the time - je la oka at eight o'clock. Add -obl- for okobla, eightfold; -on- for okono, an eighth; -op- for okope, eight together. Cardinal numerals themselves never take the accusative or the plural, so it is ok tagojn with the ending on the noun only. The compound numbers are written solid below a hundred, so eighty is okdek and eight hundred is okcent.