Answer:
加 KA, kuwa(eru), kuwa(waru) - add, append, join, take part
幾 KI, iku - how much, how many, some
久 KYUU, KU, hisa(shii) - long (time)
計 KEI, haka(ru), haka(rau) - plan, total, measure
己 KO, KI, onore - self
They are the kanji on which the following hiragana are based.
か Hiragana "Ka"
き Hiragana "Ki"
く Hiragana "Ku"
け Hiragana "Ke"
こ Hiragana "Ko"