@akronius
Look at the second chart on the Wikipedia page you used.
八 "Hachi" + 百 "Hyaku = "Happyaku" or 800
八 "Hachi" + 千 "Sen" = "Hassen" or 8,000
So 八 "Hachi" can be shortened to just "Ha".
"Ha" is one of the special kana in Japanese, it has both a "voiced" and "half-voiced" version.
は - "Ha" which is "unvoiced"
ば - "Ba" which is "voiced"
ぱ - "Pa" which is "half-voiced"
So you can get "Pa" from "Hachi".
"Tsu" is the Japanese pronunciation of the English "Two".
So 1582 is Ichi - Go - Pa
- Tsu!
Look at the second chart on the Wikipedia page you used.
There are some phonetic modifications to larger numbers involving voicing or gemination of certain consonants, as typically occurs in Japanese (i.e. rendaku): e.g. roku "six" and hyaku "hundred" yield roppyaku "six hundred".
八 "Hachi" + 百 "Hyaku = "Happyaku" or 800
八 "Hachi" + 千 "Sen" = "Hassen" or 8,000
So 八 "Hachi" can be shortened to just "Ha".
"Ha" is one of the special kana in Japanese, it has both a "voiced" and "half-voiced" version.
は - "Ha" which is "unvoiced"
ば - "Ba" which is "voiced"
ぱ - "Pa" which is "half-voiced"
So you can get "Pa" from "Hachi".
"Tsu" is the Japanese pronunciation of the English "Two".
So 1582 is Ichi - Go - Pa