The correct order from 1 to 10 in Japanese, based on the sequence you provided, is as follows:
一 (いち) - One
二 (に) - Two
三 (さん) - Three
四 (し/よん) - Four
五 (ご) - Five
六 (ろく) - Six
七 (しち/なな) - Seven
八 (はち) - Eight
九 (きゅう) - Nine
十 (じゅう) - Ten
The answer to "十 - 四" in Japanese is "六" (ろく).
In this equation, "十" (じゅう) represents the number 10, and "四" (し) represents the number 4. By subtracting 4 from 10, the result is "六" (ろく), which means 6 in Japanese.
"Jun" does not correspond to any of the correct pronunciations for the numbers from 1 to 10 in Japanese
The Japanese Kanji character for the number 7 is "七." It is pronounced as "shichi" or "nana" in Japanese.
"イチ" (ichi) is the pronunciation of the number 1 in Japanese when written in katakana, a Japanese script used for foreign words and emphasis.
The number that is missing in the given sequence is "九" (きゅう).
The sequence you provided is: 一 (1), 二 (2), 三 (3), 四 (4), 五 (5), 六 (6), 七 (7), 八 (8), 十 (10).
The number "九" (きゅう) represents the numeral "9" in Japanese, and it is missing from the sequence you provided
十" (じゅう) represents the Kanji character for the number "10" in Japanese.