100. These five characters are more well known in a slightly different form; what is it? 八 比 不 部 保

Answer:

八  HACHI, ya(ttsu), ya(tsu), ya, yo - eight

比  HI, kura(beru) - compare

不  FU, BU - negative

部  BU - part

保  HO, BU, tamo(tsu) - keep, preserve, maintain

They are the characters from which the following five katakana were derived.

ハ  Katakana "Ha"

ヒ  Katakana "Hi"

フ  Katakana "Hu"

ヘ  Katakana "He"

ホ  Katakana "Ho"