text: 엿새 yeossae ("six days") 예니레 yenire ("six or seven days")
  이레 ire ("seven days")
  일여드레 ilyeodeure ("seven or eight days")
  여드레 yeodeure ("eight days")
  아흐레 aheure ("nine days")
  열흘 yeolheul ("ten days")
  The native Korean saheul (사흘; three days) is often misunderstood as the Sino-Korean sail (사일; 四日; four days) due to similar sounds. The two words are different in origin and have different meanings.
  Cardinal numerals
  Larger numbers
  In numbers above 10, elements are combined from largest to smallest, and zeros are implied. Hanja and Hangul numerals are both multiplicative additive rather than positional; to write the number 20 you get the character for two (二/ 이) and then the character for ten (十/십) to get two tens or twenty (二十/이십).
  Pronunciation
  The initial consonants of measure words and numbers following the native cardinals  ("eight", only when the  is not pronounced) and  ("ten") become tensed consonants when possible. Thus for example:
  (twelve) is pronounced like
  (eight (books)) is pronounced like
  Several numerals have long vowels, namely  (two),  (three) and  (four), but these become short when combined with other numerals / nouns (such as in twelve, thirteen, fourteen and so on).
  The usual liaison and consonant-tensing rules apply, so for example,  yesun-yeoseot (sixty-six) is pronounced like  (yesun-nyeoseot) and  chil-sip (seventy) is pronounced like  chil-ssip.